Can you get pregnant while taking a GLP-1?
GLP-1 use during pregnancy isn't recommended. Manufacturers advise stopping at least 2 months before conception. Surprise pregnancies on these drugs are real.
Updated May 6, 2026 · 5 min read
You can absolutely become pregnant while taking a GLP-1 — and it happens more often than people expect. GLP-1 use during pregnancy is not recommended. Manufacturers (Novo Nordisk for semaglutide, Eli Lilly for tirzepatide) advise stopping the drug at least two months before trying to conceive, to clear it from your system before pregnancy begins. If you discover you're pregnant on a GLP-1, stop the drug and call your prescriber the same day.
This isn't because we've confirmed the drug harms a fetus — current human data is limited and reassuring on that front — but because we don't have enough data to confidently say it's safe, and animal studies showed reproductive toxicity at high doses.
The "Ozempic baby" phenomenon is real
Two unrelated effects of GLP-1s combine to produce surprise pregnancies:
- Fertility improves. GLP-1-driven weight loss often restores ovulation in people with PCOS, polycystic ovaries, or weight-related anovulation. Many people who'd been told they'd struggle to conceive find themselves fertile within months of starting the drug.
- Birth control may work less well. Slowed gastric emptying — the same mechanism that makes you feel full — can reduce absorption of oral contraceptives, especially after starting the drug or stepping up the dose. The Mounjaro/Zepbound label specifically calls this out.
Together, these mean a substantial number of GLP-1 users become pregnant when they didn't expect to. There's no published incidence rate yet, but anecdotal reports across the obesity-medicine community suggest it's common enough that providers now routinely counsel patients to plan for it.
What the labels actually say
| Drug | Manufacturer guidance |
|---|---|
| Ozempic / Wegovy (semaglutide) | Stop at least 2 months before planned pregnancy; not recommended during pregnancy |
| Mounjaro / Zepbound (tirzepatide) | Stop 2 months before planned pregnancy; add non-oral contraception for 4 weeks after starting and 4 weeks after each dose increase |
| Saxenda / Victoza (liraglutide) | Discontinue if pregnancy occurs; not recommended during pregnancy |
| Foundayo (orforglipron) | Discontinue if pregnancy occurs; manufacturer is collecting registry data |
The two-month washout reflects how long it takes for semaglutide and tirzepatide to clear your system — both have ~7-day half-lives, so 5–6 half-lives is roughly 5–6 weeks of clearing, with a buffer.
What the human data shows so far
GLP-1 pregnancy registries are small but growing. The published evidence as of 2026:
- No confirmed teratogenic signal in humans. Pregnancies that occurred while the mother was on a GLP-1 do not show elevated rates of birth defects compared to background rates.
- Animal studies showed adverse effects — reduced fetal growth, skeletal abnormalities — but at doses many times higher than human therapeutic exposure.
- The data set is too small to be definitive. Most published series include a few hundred pregnancies, not the thousands needed to detect rare adverse outcomes.
This is why the official guidance is conservative: stop the drug, not because we know it harms, but because we can't yet confirm it doesn't.
What to do if you get pregnant on a GLP-1
- Stop the drug. Don't take your next dose.
- Call your prescriber the same day. They'll usually want to confirm the pregnancy and may refer you to maternal-fetal medicine for early monitoring.
- Enroll in the manufacturer's pregnancy registry if your prescriber recommends. Both Novo Nordisk and Lilly maintain registries to improve future safety data — your participation helps the next person in your situation.
- Don't panic. A GLP-1 dose taken before you knew you were pregnant is not, on current evidence, a known cause of fetal harm. Most pregnancies that began on a GLP-1 have proceeded normally.
- Prenatal nutrition matters more than usual. GLP-1 weight loss can leave protein, iron, and B12 reserves lower than ideal. Your prenatal team will likely run early labs.
For more on stopping a GLP-1, see discontinuation: what the data says.
What to do if you're trying to conceive
If you're actively planning a pregnancy:
- Stop the GLP-1 at least two months before the cycle you want to conceive. This gives the drug time to clear and lets your appetite/eating return to normal so you enter pregnancy with adequate nutrition reserves.
- Expect some weight regain. Most people regain 30–60% of GLP-1 weight loss in the year after stopping. This is normal and not a reason to restart during pregnancy.
- Talk to your provider about restart timing post-partum. GLP-1s are also not recommended during breastfeeding — limited data on infant exposure. Most prescribers wait until weaning.
For the broader stopping conversation, our discontinuation cluster covers what to expect.
Common related questions
Does Ozempic affect male fertility? Limited data, but no documented harm to sperm count or quality. Men trying to conceive don't currently need to stop GLP-1s for fertility reasons.
Will GLP-1s cause infertility long-term? No. The drugs work through hormone signaling that resets when you stop. Fertility typically returns within weeks of discontinuation.
Can I use Wegovy if I'm breastfeeding? Not recommended. Limited data on infant exposure. Most prescribers wait until you've weaned.
My birth control failed — is that normal on a GLP-1? Possible if you take oral contraceptives and recently started a GLP-1 (especially tirzepatide) or stepped up the dose. The slowed gastric emptying can reduce hormone absorption. Talk to your prescriber about adding a backup method or switching to a non-oral form.