Birth Control When Pregnant? Everything You Never Knew You Needed To Know!

Are you looking for the Holy Grail of contraception — a method that is completely foolproof? Sorry, ladies. Other than abstinence, there is no 100 percent effective method.

Every form of contraception has a chance of failing. So what happens when pregnancy and contraception come face to face?

Maybe this has already happened to you. Maybe you are worried it is happening to you. Or maybe you just want to be informed.

But don’t worry — we’re here with the facts!

Let’s explore the different ways contraception can fail, situations where you might stay on birth control even after becoming pregnant, and what happens when you are pregnant and on birth control.

Will Contraception Ruin My Fertility?

First of all, let’s get this out of the way — birth control methods do not harm your long-term fertility. Some research used to suggest being on hormonal contraception for a long time increased your risk of infertility, miscarriage, and birth defects.

But do you know what else coincides with being on contraception a long time? Being older.

It has long been known that the more outside the age range of 20 to 35 you are when you are trying to become pregnant, the higher your risk of infertility, miscarriage, and birth defects. Quite simply — the slightly higher risks are just the normal risks faced by women of that age. Nothing to do with contraception!

Older forms of contraception also may have affected women’s fertility, but what was true in 1970 or 1990 is not true in 2018. All these decades of research and new developments mean most contraception is very, very safe to use (source).

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Could I Be Pregnant? I’m On The Pill!

It’s well documented that the pill can fail. If you use it perfectly — take it for a week before having unprotected sex and take it every single day — it is 99 percent effective.

If you use it as the average user does — a few missed pills, unprotected sex a bit too early — it is still 91 percent effective. This means that around one in 10 pill users gets pregnant every year — so yes, you could be pregnant (source).

The best way of making sure your pill works effectively is to take it every day. The pill has been connected to slight short-term memory problems, which can lead to forgetting to take it, so make sure to make it part of your morning or evening routine.

If you are on a combination pill, take it a week before having unprotected sex. If you are on the mini pill, take it for 2 to 3 days before having unprotected sex.


If you are taking the antibiotic Rifampin, the antifungal Griseofulvin, or the herbal remedy St. John’s Wort, your pill may be less effective. And if you are on HIV or seizure medication, talk to your doctor about whether it could affect the pill.

Finally, if you are vomiting, remember that you could have vomited up the pill, making it less effective.

Should I Stop Taking The Pill?

The only person who can tell you this for sure is your doctor. Depending on your reason for taking the pill, you might be asked to stay on it a while longer, be offered an alternative, or be told to stop it entirely.

But remember, most of the reasons for taking the pill are related to your period. Acne, mood swings, menstrual cramps, and other problems that are fixed by the pill are probably hormonal, and will most likely go away if you are pregnant.

Are There Any Risks If I Am On The Pill?

There is not a lot of research on humans concerning this, and the research that exists is not truly conclusive. It used to be believed being on the pill while pregnant increased your chances of miscarriage, but this has now found to be false.

However, some animal studies have found an increased risk of miscarriage and some human studies have found an increased risk of low birth weight.

The best option, if you want to be truly safe, is to stop taking the pill. But if you can’t, or if you didn’t know you were pregnant and were taking the pill, there is no reason to worry.

Could I Be Pregnant After the Implant Too?

Yes, the birth control implant can fail as well. There are on average 15 pregnancies per 1,000 women who have received the implant.

That means the implant, when inserted correctly, is slightly less effective than the pill.

The advantage? Chances are the implant will be inserted correctly by a professional. On the other hand, we have already seen the pill is not always used successfully.

Nevertheless, even with an implant, you can get pregnant. This is especially true if you were under 25 years old or weighed over 154 pounds when it was implanted (source).

Is It Safe To Leave the Implant In If I Am Pregnant?

Depending on the implant you have, there are some distinct risks associated with leaving it in when pregnant.

If you become pregnant with an implant inserted, you have a higher-than-average risk of ectopic pregnancy. This is when the fetus implants outside the womb, which can put your life at risk. Your risk of miscarriage is also elevated, even if the fetus implants normally.

For these reasons, it is essential to see your doctor if you feel cramps, have bleeding, or get a positive pregnancy test when you are on the implant. They will then advise you about removing it (source).

Implants and injectable progestins like DepoProvera will often stop your periods, making it difficult to know if you are pregnant. For this reason, I’d advise paying attention to things like nausea and breast tenderness as possible signs indicating you should take a pregnancy test.
Headshot of Christine, Traxler, MD, BS

Editor's Note:

Christine Traxler, MD, BS

Could I Be Pregnant Even With An IUD?

Again — no contraception is perfect, and that includes intra-uterine devices. The IUD is 99.7 percent effective. That means every year, three out of 1,000 women with an IUD will become pregnant.

So it is one of the best contraceptives for preventing pregnancy, but it is possible to get pregnant with an IUD.

Stay Vigilant

Because a quarter of women experience no periods with an IUD, and many more experience missed or lighter periods, it’s important to keep an eye out for symptoms of pregnancy and have a test if you are suspicious.

What Do I Do With My IUD If I Get Pregnant?

If you are pregnant with an IUD, it’s vital to go to your doctor immediately. Like with the implant, there is an increased risk of ectopic pregnancy, which can permanently damage your reproductive system or even kill you.

And if you want to keep the baby, bear in mind you are 50 percent more likely to have a miscarriage if the implant is not removed, and 25 percent more likely even if it is. You will probably need to watch your pregnancy very closely to make sure it progresses normally (source).

Can I Get Pregnant If I’m Already Pregnant?

You might have heard about this and be wondering about it, so here goes — yes, you can get pregnant when you are pregnant.

This is very rare, but sometimes one ovary will release an egg, which will become fertilized, and then the other ovary will release an egg a few weeks later, resulting in two babies conceived at different times. Sometimes the babies are not born at the same time, but usually, they are.

And, fortunately, the pregnancy hormones that start two to six weeks after fertilization will stop your ovaries from releasing any more eggs, so a big difference in development is unlikely (source).

Should I Try To Use Protection If I’m Already Pregnant?

Despite the small possibility of a double pregnancy, there is no point in using protection to prevent it if you know you are pregnant. By the time you know, the risk is gone.

But the risk of a sexually transmitted infection is still very real, no matter how far along your pregnancy is. And as STIs can affect your pregnancy and long-term fertility, you should use condoms if you are having sex when you are pregnant, especially if you are with a new partner.

The Bottom Line

It is super important to not panic about any of this. All the situations described above are pretty rare.

If you are on contraception and you are late, chances are you are just experiencing a common side effect of your contraceptive, having a late or missed period, or suffering a hormonal imbalance.

Take a pregnancy test to be on the safe side. Sometimes if you are on hormonal contraception you can get a false positive, but this is rare, and you are no more likely to get a false negative.

If you aren’t pregnant — no worries. Chances are you will never experience anything described here.

If you are pregnant, the best course of action is to stop any contraception and talk to your doctor immediately. Remember whether you want to continue the pregnancy or not, the contraceptive could have some effect depending on your situation.

Only a doctor can tell you how everything is going and what your options are.

Above all, stay safe, look after your health, and don’t fear your contraception, As we’ve seen, it is amazing, and the side effects and risks are so minimal compared to the consequences of not taking it.

What contraception are you on? Is it working as intended? We’d love to hear about your experiences of contraception and pregnancy in the comments!

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