Ozempic, Wegovy, Mounjaro and Zepbound in Pregnancy: Birth Control, Fertility and Breastfeeding
GLP-1 drugs before and during pregnancy: US labels vs Canadian monographs, why Zepbound and Mounjaro affect the pill, birth-defect studies, breastfeeding.
Anonymous user report. Not medical advice. Peptides discussed are not FDA-approved for the uses described. Editorial process →
Short answer
None of these drugs is meant to be used in pregnancy. The US labels for Ozempic and Wegovy (semaglutide) say to stop at least 2 months before a planned pregnancy because semaglutide stays in the body for weeks, and the Zepbound label says to stop when a pregnancy is recognised. In Canada, Mounjaro and Zepbound are contraindicated in pregnancy and should be stopped at least 1 month before a planned pregnancy, and Ozempic and Wegovy should not be used in pregnancy or while breastfeeding. Tirzepatide (Zepbound, Mounjaro) can make birth control pills less reliable, which is one reason "Ozempic babies" became a phrase. Studies of accidental early exposure have not shown a large rise in birth defects, but the data are limited. If you are pregnant or trying, talk to your prescriber before stopping or starting anything. Not medical advice. Peptide Confessions does not publish dosing, timing, injection or sourcing guidance. Facts checked October 28, 2026.
What each label says about pregnancy
From the US prescribing information (Ozempic, Wegovy, Mounjaro, Zepbound, DailyMed, 2026) and the Canadian product monographs (Ozempic, July 13, 2026, Wegovy, October 2, 2026, Mounjaro, June 2026, Zepbound, June 11, 2026). Human pregnancy data are too limited for any of them to rule out risk; animal studies showed harm to the fetus, mostly alongside weight loss in the mother.
| Drug | US label | Canadian monograph |
|---|---|---|
| Ozempic | Use in pregnancy only if benefit justifies risk; stop at least 2 months before a planned pregnancy | Should not be used in pregnancy; stop at least 2 months before a planned pregnancy; contraception recommended |
| Wegovy | Stop when pregnancy is recognised (weight or heart-risk use); stop at least 2 months before a planned pregnancy; pregnancy registry | Should not be used in pregnancy; stop at least 2 months before a planned pregnancy; contraception recommended |
| Mounjaro | Use in pregnancy only if benefit justifies risk; pill warning (below) | Contraindicated in pregnancy; stop at least 1 month before a planned pregnancy; pill warning |
| Zepbound | May cause fetal harm; stop when pregnancy is recognised; pill warning; pregnancy registry | Contraindicated in pregnancy; stop at least 1 month before a planned pregnancy; pill warning |
Why weight-loss use is stopped in pregnancy
The Wegovy and Zepbound labels give the reason plainly: weight loss offers no benefit in pregnancy and may harm the fetus, and some weight gain is recommended for everyone who is pregnant, including people with obesity. Ozempic and Mounjaro are diabetes medicines, and poorly controlled diabetes in pregnancy carries its own risks, so their US labels leave room for a specialist to weigh it, and the Ozempic label tells patients to ask their provider about the best way to control blood sugar when planning a pregnancy. The washout times come from half-life: semaglutide has a half-life of about a week, so it takes weeks to clear (see how long Ozempic stays in your system).
Zepbound, Mounjaro and birth control pills
Tirzepatide slows stomach emptying, most after the first dose, and in a label study it cut peak levels of the hormones in a combined pill by more than half. The Zepbound and Mounjaro labels, US and Canadian, advise people on oral hormonal contraceptives to switch to a non-oral method, or add a barrier method such as condoms, for 4 weeks after starting and for 4 weeks after each dose increase. The US labels say hormonal contraceptives that are not taken by mouth should not be affected. The semaglutide labels (Ozempic, Wegovy) report no clinically relevant change in pill hormone levels, but vomiting or severe diarrhoea can stop any pill from being absorbed, so check the pill leaflet's advice for sickness.
"Ozempic babies": fertility and surprise pregnancies
The phrase describes unplanned pregnancies on GLP-1 drugs. Two things can contribute: the tirzepatide pill interaction above, and weight loss itself, which can bring back ovulation in people whose cycles had stopped, notably with polycystic ovary syndrome (PCOS). A 2026 systematic review of 36 studies (Ozbek 2026) called GLP-1 drugs promising in PCOS. None of these drugs is approved as a fertility treatment, and the labels still say to stop before trying to conceive. If periods return or change, that is a reason to review contraception or pregnancy plans with a clinician. More on the wider topic: fertility.
If you got pregnant while taking one
Tell your prescriber or prenatal care provider promptly; they decide what to stop and how to manage blood sugar if you have diabetes. The evidence on accidental early exposure so far:
| Study | What it found |
|---|---|
| Cesta 2024 (JAMA Internal Medicine) | Nordic, US and Israeli data on 51,826 infants of mothers with type 2 diabetes: 938 exposed to GLP-1 drugs around conception or in the first trimester had no higher rate of major birth defects than insulin-exposed infants (adjusted risk ratio 0.95) |
| Dao 2024 (BMJ Open) | 168 pregnancies exposed in the first trimester, from six teratology information services: major birth defects 2.6% vs 2.3% with diabetes and 3.9% with overweight or obesity; no increase in pregnancy loss |
| Brown 2026 (Annals of Internal Medicine) | 3,572 US pregnancies: continuing a GLP-1 drug into the first trimester vs stopping did not clearly raise the risk of pregnancy loss (29.7% vs 27.1%), birth defects or abnormal growth, but the estimates were imprecise and could not rule out a meaningful increase |
| Ozbek 2026 (Diabetes, Obesity and Metabolism) | Systematic review of 36 studies: early exposure not consistently linked to birth defects, growth restriction or stillbirth; data on use later in pregnancy are limited |
Pregnancy registries
The US Wegovy and Zepbound labels list pregnancy exposure registries that collect outcomes from people exposed in pregnancy; contact details are in section 8.1 of each label. Your prescriber can help you enrol. Canadians can report suspected side effects to the Canada Vigilance Program.
Breastfeeding
The labels differ more than the data do. In a small US study of eight women on injectable semaglutide (Diab 2024), semaglutide was not detected in any milk sample, and the NIH LactMed database notes no adverse effects in their infants. In the tirzepatide lactation study in the Zepbound and Mounjaro labels (11 women), tirzepatide was undetectable in 164 of 171 milk samples. Even so, the Canadian Ozempic and Wegovy monographs say not to use them while breastfeeding, and the US Wegovy label says breastfeeding is not recommended with Wegovy tablets because of an absorption enhancer (SNAC) that does pass into milk. The US injectable labels and the Canadian Mounjaro and Zepbound monographs ask the prescriber to weigh benefits and risks. There are no data on effects on milk supply or long-term infant growth.
In Canada
Canadian monographs are stricter than US labels here: Mounjaro and Zepbound are formally contraindicated in pregnancy with a 1-month washout before a planned pregnancy, and Ozempic and Wegovy carry "should not be used" wording for both pregnancy and breastfeeding, with a 2-month washout. All four Canadian monographs recommend contraception during treatment, and both tirzepatide monographs carry the same pill advice as the US labels. More: Ozempic side effects in Canada and Mounjaro side effects in Canada.
What users report here
Fertility and pregnancy come up in a handful of live confessions (checked October 28, 2026). #686, who has PCOS, saw no early weight change on semaglutide but her period returned after years without one. #166 lost 40 lb on semaglutide and got pregnant after 8 years of trying, and #854 got pregnant on Zepbound after ten years and two rounds of IVF. #817 found out she was 9 weeks pregnant while using retatrutide, an unapproved drug with no pregnancy data, stopped that day, and had not yet told her obstetrician. #825 says the wish to have children faded on Ozempic and then retatrutide. Stories, not evidence; anyone in #817's position should tell their prenatal care provider everything they took.
Related topics
related peptides:
in Canada:
community guides:
More confessions from the archive
Community Q&A
- Can you take Ozempic while pregnant?
- No, not routinely. The US label says to stop at least 2 months before a planned pregnancy, and the Canadian monograph says Ozempic should not be used in pregnancy. If you have diabetes, your care team will advise on blood-sugar control.
- How long before trying to get pregnant should I stop Ozempic or Wegovy?
- The US and Canadian labels say at least 2 months, because semaglutide takes weeks to clear. Discuss timing with your prescriber.
- How long before pregnancy should I stop Mounjaro or Zepbound?
- The Canadian Mounjaro and Zepbound monographs say at least 1 month before a planned pregnancy. The US Zepbound label says to stop when pregnancy is recognised and does not give a washout period.
- Does Zepbound or Mounjaro affect birth control?
- Yes, for pills. Tirzepatide can reduce pill absorption, so the labels advise a non-oral method or adding condoms for 4 weeks after starting and after each dose increase. Hormonal methods not taken by mouth should not be affected.
- Does Ozempic affect birth control pills?
- The semaglutide labels report no clinically relevant change in pill hormone levels, but vomiting or severe diarrhoea can stop a pill being absorbed.
- What are Ozempic babies?
- Unplanned pregnancies in people taking GLP-1 drugs, linked to weight loss restoring ovulation and, with tirzepatide, reduced pill reliability.
- Does Ozempic cause birth defects?
- Large studies of accidental early exposure have not shown a large increase in major birth defects compared with insulin, but data are limited and the labels still advise stopping before pregnancy.
- Can you breastfeed on Ozempic or Zepbound?
- Small studies found little or no drug in breast milk, but the Canadian Ozempic and Wegovy monographs say not to use them while breastfeeding and US labels ask the prescriber to weigh it. Ask your clinician.
- Does this page give dosing advice?
- Peptide Confessions does not publish dosing, timing, injection or sourcing guidance.
Sources
Last reviewed November 11, 2026. Anonymous first-hand reports plus sourced context — educational only, not medical advice. Editorial policy & corrections.