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Reasons Why Your Period Is Late When You're Not Pregnant


Top Ten Reasons Your Period Might Be Late

  • You ovulated late
  • You're exercising more or less than usual
  • You're not eating enough
  • You're nearing menopause
  • You've recently been down with a cold, flu, or other virus or infection
  • Stress is getting to you
  • You're dealing with a treatable medical condition that messes with your period
  • Your schedule or sleep patterns have recently changed
  • Your meds are goofing up your period
  • You're breastfeeding

So, you're staring squinty-eyed at your period tracker wondering where in the living bleep your cycle is hiding. The annoying truth is that from illness to exercise, there are a lot of reasons that your period could be late or might not even show up at all this month.

Here's what to know about late or missed periods when you know you're not pregnant.

You Ovulated Late

Ovulating late is the most obvious and common reason that periods are a few days behind schedule.

Why It Might Be Happening

Contrary to period calculators and cycle predictors, periods don't always follow an exact rhythm, however, it all centers around when you've ovulated. If you ovulated on a later schedule this month than you have in the past then your period will appear late when really it's right on time according to your late ovulation. Unless you're tracking your ovulation through a reliable method (like tracking your basal body temperature or utilizing ovulation kits) then you won't really know the exact day that you ovulated, thus making predicting the exact start of your menstrual cycle a bit tricky!

If your body doesn't release eggs, it doesn't ovulate, and if it doesn't ovulate, you're not going to get a period.

If your body doesn't release eggs, it doesn't ovulate, and if it doesn't ovulate, you're not going to get a period.

You Didn't Ovulate at All

For some of us, our cycle is like clockwork every single month then all of the sudden, bam, late period. Sometimes the cause of a late period isn't pregnancy or even delayed ovulation, but rather that you haven't ovulated at all.

Why It Might Be Happening

Why would you just not ovulate? From a hormone imbalance to polycystic ovary system (PCOS) there are actually a lot of different reasons you might not ovulate one month or that you may stop ovulating for a few months straight.

You Have Recently Changed Your Exercise Habits

So maybe you're a couch potato who just started training for a marathon (no judgement and congrats on the marathon ambitions), or your mom just bought you your first FitBit and you're absolutely annihilating your sister-in-law in the Daily Step Challenges. Awesome, right?!

Why It Might Be Happening

When you exert your body beyond its usual efforts then that primal, ancestral instinct that was long-forgotten generations upon generations ago sometimes rears its ugly head and says "Wow, you're running a lot, maybe you're being chased by bears all of the time. The last thing we're going to do here is let you grow a baby because that's going to require a lot of fat and rest, something you don't really have room in your life for because you are running from bears almost constantly. Surely if you become pregnant you will die and so will your twenty other children whom you care for and then a third of earth's total population will cease, so yeah, we're just gonna put that ovulation on hold."

Damn, your body is really smart.

But since hopefully you're not actually being chased by bears every day like your great, great, great (repeat this like a hundred or so times) grandma once was, go ahead and put your feet up, enjoy a little Netflix and a pint of Chunky Monkey and give your bod a chance to catch up to current day issues—like ovulating, so you can start your period.

Is your new exercise routine working a little too well? Excessive weight loss can cause a delayed or skipped period.

Is your new exercise routine working a little too well? Excessive weight loss can cause a delayed or skipped period.

You're Not Eating Enough

All of my friends are on a diet. Some of them just eat particular fruits while others eat all of the meat.

Why It Might Be Happening

If you're on a diet that works for you, cool, but if it's caused you to lose an excessive amount of weight recently (around eight pounds a month is a healthy loss goal, anything more than that can be considered excessive) then it's possible that OMG BEARS! Your body is going to think the bears are after you, that maybe you've been running from bears too much and there aren't enough berries in the forest and you are going to die of starvation because why else would you suddenly be dropping so much weight? According to evolution, a starving woman is no place to home a fetus, so that ovulation gets axed.

See? Are you starting to see how this whole late period thing works now?

Your Body Is Nearing Menopause

The first time I got my period, I cried in the bathroom of a pizza parlor. I was 12 and way too young for this shit.

You're probably feeling the same way about menopause. Here's the thing though, evolution. I should have just named this article "Evolution: Why Your Period is Such a Sneaky Sneak."

But it's the truth, life was a lot shorter back in the stone age (or whenever) and peeps were having babies real young and dying by thirty. This is probably why perimenopause, the brief stage before actual menopause, can begin as early as a woman's 30s or 40s. If you made it that long way back when, you were definitely not in a position to be having more kids, especially after decades of running from bears.

Why It Might Be Happening

If you're in your 30s or 40s and experiencing late or missed periods along with symptoms like hot flashes, low sex drive, and fatigue you may be entering the early stages of menopause.

You Are or Have Recently Been Sick

Did you have the sniffles last week? Are you in the throes of a wretched stomach virus? Coming down with a bug can throw off ovulation big time.

Why It Might Be Happening

Catching the latest illness-of-the-week won't just put you out of work and leave you with a pile of backed-up laundry and dishes, getting sick can also be a signal to your body that you're not well enough to reproduce (and I mean, that's probably true, no one wants to baby dance when they have diarrhea), delaying your ovulation which can cause your period to be seriously late, maybe even by a whole cycle.

So if you're two weeks late for your period and still pulling stark white Big Fat Negatives on those pregnancy tests take a deep breath, guzzle some water, and get your health back in business so your body can get on track to returning to its regularly scheduled ovulation.

Everything from illness to anxiety can prolong the start of your period. *Deep sigh*

Everything from illness to anxiety can prolong the start of your period. *Deep sigh*

You're Stressed

Back to that evolution thing, your body is really scared of bringing a baby into the picture when you can barely handle that bear that has come to kill you and your whole family. Because seriously, how are you going to simultaneously grow a fetus while fending off a predator with only a few scarce berries in your stomach?

But now the bear is a late mortgage payment or a failed college class or your parent's divorce (or your divorce) and your period is MIA which is stressing you out even more.

Why It Might Be Happening

No period = no ovulation = no baby growing = maybe you will have the energy to survive this bear fight and continue to carry on human existence for another generation.


If you think your period is late due to stress it's time to take a hard look at your circumstance and make a plan of attack for how to deal with the bears in your life so you can be chill enough to get your cycle and your life back on track.

Stressing about your late period could be why your period is late. Conundrum, am I right?

Stressing about your late period could be why your period is late. Conundrum, am I right?

You're Dealing With a Treatable Medical Condition

In some cases, a missed period could be a sign of a medical condition like a thyroid disorder, a non-cancerous tumor, or even scar tissue from a previous procedure, all of which require a medical diagnosis to treat.

Why It Might Be Happening

Just like getting sick can interrupt your ovulation cycle, having a medical condition that interferes with your hormones can put that monthly cycle on pause.

You're Working a New Shift

By now you're probably like, "Okay, wow, what CAN'T affect my period."

Which brings us to: Taking on a new shift at work can totally cause your period to be late.

Why It Might Be Happening

Simply put, our circadian rhythm controls a whole slew of other biological rhythms (like ovulation) and if you're taking on a new shift at work, or your shifts are constantly changing, you're probably not getting regular sleep or sticking to a solid bedtime with can interrupt your circadian rhythm. A messed-up circadian rhythm can = a messed-up menstrual cycle.

Your Medication

If you're taking any meds, read up on the side effects to find out if late or missed periods are one of them.

Why It Might Be Happening

Many medications, from birth control to anti-psychotics can cause missed periods.

You Are Breastfeeding

If you're one of the lucky ones who haven't had a period since you started breastfeeding then chances are it's as simple as that—you're breastfeeding.

Why It Might Be Happening

I'm going to blame this one on evolution too, since, way back when, it would have been hard to find enough food to eat to produce breast milk and nourish a growing fetus (two things that make you pretty darn hungry) at the same time. Prolactin, the hormone that tells your body to make milk, also tells your body to quit making things cozy for a new baby, so you stop ovulating for a while.

You can basically blame like 95% (not a scientific number) of your period problems on bears.

You can basically blame like 95% (not a scientific number) of your period problems on bears.

When to Call Your Doctor

Some sites will say to call your doctor when you're almost dead. But I say, call your doctor when you feel like it. If you're late for or skip one period and have no other obvious symptoms you're probably good to wait and see what happens next month, but if you're really concerned or just curious, call 'em up and have a chat about what concerns you should look out for and what constitutes a visit to the office.

Apps That Track Your Period

If you want to get an idea of when you can expect your period to arrive you should definitely be using one of these apps to track your cycle and receive notifications on when you're coming up to your fertile window, when you should be starting your period, and when you're officially late. Plus, these apps take data from all of your past cycles to help determine things like what symptoms are typical for you on certain days of your cycle along with helpful tips for making your period symptoms as bear-able as possible. (See what I did there?)

  • Clue Period Tracker: Period & Ovulation Tracker
  • Pink Pad
  • Life Period Tracker, Health, Calendar, Ovulation
  • Flo Period Tracker: Period & Ovulation Tracker

Tools to Track Your Ovulation

One of the smartest ways to track your period is to know when exactly you've ovulated. If you've ever leafed through your mom's copy of Taking Charge of Your Fertility or browsed BabyCenter at all then you already know that the best way to track your ovulation is by monitoring your basal body temperature with a BBT thermometer or through at-home ovulation tests. A few options to track your ovulation include:

  • A digital BBT thermometer. With this tool, you can manually track your basal body temperature throughout your cycle to know on which day you ovulate.
  • A bluetooth BBT thermometer. Instead of manually recording your BBT with a digital thermometer, a bluetooth BBT thermometer and app do the work for you, all you have to do is remember to take your temp. Without much effort you'll know exactly when you're about to ovulate each month, giving you a solid idea of when to expect your period.
  • At-home ovulation test kits. These are a lot like pregnancy tests, only instead of telling you if you're pregnant, these tests tell you if you're ovulating without all of the extra effort of tracking your temperature.

This content is accurate and true to the best of the author’s knowledge and does not substitute for diagnosis, prognosis, treatment, prescription, and/or dietary advice from a licensed health professional. Drugs, supplements, and natural remedies may have dangerous side effects. If pregnant or nursing, consult with a qualified provider on an individual basis. Seek immediate help if you are experiencing a medical emergency.

Questions & Answers

Question: My period is three days late. I have taken two or three pregnancy tests, and they've come back negative. I don't 'feel' pregnant, I have two children and I knew way before being due on with them but this is so stressful. In the last month I had Bacterial Vaginosis and had antibiotics and then had a bad case of thrush, is this something that would delay a period? I guess only time will tell but any advice would help.

Answer: An infection will delay your period! And yes, it is SO stressful. Something I know just from my pregnancies is that typically, I've been able to get positives at the same time with each pregnancy. If you had positive HPTs early on in your last pregnancies, then I think that chance of you being pregnant right now are slim since you're getting negatives and your period is already late.

Since your body was fighting an infection, it probably decided to delay ovulation.

Alternatively (and less likely if you were using a non-hormonal birth control method) antibiotics can mess with birth control. So, if your only method of birth control has been a hormonal one (like the pill), then you should take another test shortly just to confirm that you're not pregnant.

Question: I'm 14 days late with a negative pregnancy test and no symptoms. Do I need to see a doctor?

Answer: No, not yet, but you should call one! Call your general practitioner (or better yet, your gynecologist) and let them know you're two weeks late for your period but apparently not pregnant. They may want you to come in for a blood pregnancy test since for some women these seem to be more accurate than urine tests. Even if they don't want to see you, they'll have a record of the late period so that if it continues they're aware of when the issue started.

Don't panic about a late period, remember there's a lot of pretty harmless reasons, besides pregnancy, to go through this including:

- Late or missed ovulation. A late or missed ovulation means you'll be late for or miss your period since you need to ovulate to get a period.

- Stress. Stress can delay your ovulation and cause a late period.

- Illness. Are you getting over a cold or stomach bug? Viruses can cause your ovulation (and thus, your period) to be delayed.

Question: Can a late period cause nausea, even if you aren't pregnant?

Answer: If your period is late and you’re feeling nauseous, you’re probably quick to think you’re pregnant. But if you haven’t had sex recently or you’ve taken a pregnancy test and it’s come back negative then why the nausea? Isn’t that a classic pregnancy symptom? Yep, but it’s also a classic symptom of PMS because before your body begins it’s menstrual cycle it releases prostaglandins. Prostaglandins, in really simple terms are chemicals that start reacting all over your body and they make you feel as weird as pregnancy hormones can. It’s natural, it’s normal but it’s really annoying and one of the nasty feelings that the release of prostaglandins can give you is nausea which can lead to vomiting (though just because you’re nauseous before your period doesn’t mean you’ll throw up).

You probably feel some level of nausea leading up to your period most cycles anyway, but if you’re late you’re definitely going to notice it more because now you’re paying more attention to your body and wondering when you’re going to finally start your freaking cycle and the nausea is just adding to the drama.

Personally, the later my period is, the worse my premenstrual symptoms get including sensitivity to smell, body aches, fatigue and yes, nausea. I don’t have an explanation for this since I’m not a doctor, but I bet it’s not too uncommon for other women as well.

The way I combat this nasty symptom is to just take it easy on myself. I take more breaks throughout the day, make sure I’m eating well (and enough) so I don’t add more nausea to the mix, and try to get to bed a little earlier (though that’s hard with two kids sometimes).

*Deep sigh* Sometimes being a woman is just hard. Especially the week before our period.

Question: Why is my period late but I’m cramping?

Answer: You’re cramping because your period is probably on its way! Nothing is more frustrating than a late period - except a late period with symptoms that feel like your period should be starting any minute. If your cycle is a few days late, but you’re starting to cramp, then there’s a good chance that you actually are about to start and, for whatever reason, your cycle was just delayed. This is especially so if you’ve taken a pregnancy test since your period became late and it came back absolutely negative.

A few things that can cause your period to be late are sickness (like a recent cold or stomach virus), stress (like waiting to find out if you got the job you interviewed for), and a change in your sleep schedule (like dealing with insomnia). That’s because these things can delay your ovulation and the timing of our period is really determined by when we ovulate - periods typically start around two weeks (14 days) after the start of ovulation. That means if you were really stressed about that huge job interview you had, and that delayed your ovulation by five days, then there’s a good chance your period will be five days late too!

Now, if your cycle is late, if you’ve recently had unprotected sex, you’re cramping and you haven’t taken a pregnancy test, now would be the time! Cramping happens when your body is preparing to shed that lovely uterine lining, but it’s also a super common early pregnancy symptom that I personally experienced each time and it happens because hey, there’s a lot going on in that region during the first few weeks after conception including the stretching of your uterus.

Does that mean that every time your period is late, you could be pregnant? No way! More often than not, a late period is simply that, and the cramping is just an indication that it’s finally on its way. If you experience late periods for several cycles, it’s not a bad idea to bring it up with your primary doctor of your gynecologist since that can be a sign of a treatable thyroid condition and other benign but treatable issues that will make your life a lot easier if you address.

© 2017 Kierstin Gunsberg


Perly on October 21, 2018:

I am turning 48 on January with 2 kids 12 yrs old and 6 yrs old.I had my c section when i had my 2nd child and been tied up on the day of my c section.Had unprotected sex on August 22 and i had my period the following day for 5 days.Had protected sex the following month a week before my expected period.My period didnt come on my expected date of my period.Since then no discharged my panty was dry no signs of ovulation.Then recently had unprotected sex again.A day after sex my vagina was been itchy then i called my doctor but unfortunately she’s i vacation so i went to buy monistat cream to stop the itchbut it didnt work.So i used home remedy like warm water with vinegar and salt to wash my vagina i did that for 4days now and its getting better.Since when i start washing with that i starting having vaginal discharge and my lower abdomen is cramping and my breast slightly sore but because im curious if im pregnant or not i tried to take pregnancy test but it turned negative.My period is passed due for this month.What could be the cause of missing my period?