Ozempic Babies: GLP-1, Fertility, and Contraception

Women are unintentionally getting pregnant while using weight loss injections like Ozempic, resulting in what are known as Ozempic Babies. This article explains why GLP-1 can increase fertility, when the birth control pill becomes less effective, and what you need to consider if you want to conceive.

Key Takeaways

GLP-1 injections can restore ovulation through weight loss and improved insulin levels; fertility often increases unnoticed.
Even a five to ten percent weight loss can normalize ovulation.
Tirzepatide (Mounjaro) can weaken the effect of the pill, while Semaglutide (Ozempic) does not directly.
If planning a pregnancy, discontinue in good time: Semaglutide about two months prior, Tirzepatide about one month prior.
GLP-1 is not a fertility medication and is not recommended during pregnancy.

In my consultations, questions about Ozempic have been increasing for some time. Among them, the following two questions are frequent: Can I get pregnant simply by using weight loss injections, and is my birth control pill still effective? Both questions have a very real background that has not been discussed enough. That's precisely why I want to calmly explain what is behind the Ozempic babies.

GLP-1 receptor agonists such as Semaglutide (Ozempic, Wegovy) and Tirzepatide (Mounjaro) were originally developed for diabetes and weight reduction. Because they suppress appetite and aid in weight loss, many women of childbearing age now use them, and this is precisely where two often-overlooked side effects arise: altered fertility and a potential interaction with the birth control pill.

Did you know?

According to the German Diabetes Association, a weight loss of just five to ten percent can normalize ovulation. Women who previously did not have a regular cycle can thus regain fertility unnoticed.

Why ovulation can return with GLP-1

In many women with overweight or PCOS, ovulation is disrupted because an excess of insulin and its hormonal consequences inhibit egg maturation. GLP-1 medications indirectly intervene here: through weight loss and improved insulin sensitivity, hormonal regulation restarts, and ovulation resumes. Thus, the injection does not act on the ovaries but through metabolism; the result is still a return of fertility.

Ozempic or Mounjaro: the difference for the birth control pill

Many misunderstand this point, yet it is crucial: the two common active ingredients behave differently towards the birth control pill.

Active Ingredient	Effect on the Pill	What to Note
Semaglutide (Ozempic, Wegovy)	According to product information, no direct effect	Absorption can be affected by vomiting or diarrhea
Tirzepatide (Mounjaro)	Can weaken the effect of oral pills	For four weeks after starting and after each dose increase, use additional barrier contraception or switch to an IUD or implant.

The reason for the difference with Tirzepatide is the slowed gastric emptying, which can impair the absorption of the pill. With Semaglutide, this effect is not expected according to the approval, but you can achieve safer contraception in both cases with a non-oral method.

Why fertility can increase under GLP-1

The reason for the many unexpected pregnancies is not a fertility-boosting effect of the injection, but rather metabolism. Obesity and insulin resistance, as is typical in PCOS, can disrupt or completely prevent ovulation. When GLP-1 therapy lowers weight and improves insulin sensitivity, many women's cycles normalize and ovulation returns.

The extent of this effect surprises many: According to the German Diabetes Association, a weight loss of just five to ten percent can normalize ovulation. So, someone who had no or only rare periods for months and suddenly ovulates regularly again has unknowingly become fertile again, even if contraception seemed long since written off.

The natural side: PCOS, lifestyle and inositol

The crucial point here: This pathway via weight and insulin does not only work with medication. The same five to ten percent weight loss through diet and exercise works on exactly the same axis. For PCOS, inositol(myo- and D-chiro-inositol) is also being investigated, which supports insulin utilization. The study data is mixed; the current international PCOS guideline classifies the evidence as not yet conclusive, but as a well-tolerated component, inositol has its place. You can read more about how you can support your fertility with PCOSin our own article.

It is important to honestly classify: Neither a GLP-1 injection nor a supplement is a fertility drug. Both work indirectly via metabolism. If you are looking for natural ways to achieve a more stable cycle, you can find more in the article on naturally supporting GLP-1.

Cycle+ Formula: the natural way

The effect of GLP-1 injections on fertility is mediated by weight and insulin. This is precisely the axis that Cycle+ Formula addresses: it combines Myo- and D-Chiro-Inositol, which are being studied in relation to insulin metabolism and ovulation, as well as zinc, which contributes to normal fertility and reproduction.

€75,00

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Desire to conceive: discontinue in good time

If you wish to become pregnant while on GLP-1 therapy, the timing of discontinuation is crucial, as these medications are not approved during pregnancy. Due to their long retention time in the body, recommendations vary depending on the active substance.

For semaglutide (Ozempic, Wegovy), manufacturers recommend discontinuing the medication at least two months before a planned pregnancy due to its long half-life. For tirzepatide (Mounjaro), about one month is recommended. If a pregnancy occurs unexpectedly, the preparation should be discontinued, and medical advice should be sought. These decisions always belong in medical hands; do not discontinue anything on your own initiative or change any dose without consultation.

GLP-1 in pregnancy: the current status

GLP-1 receptor agonists are not recommended during pregnancy. Animal studies at clinically relevant doses showed increased growth disturbances and malformations. For humans, the data is limited: A 2024 cohort study with 168 pregnancies, where a GLP-1 medication was inadvertently taken in the first trimester, found no increased risk of malformations compared to women with diabetes or obesity.

This is reassuring in the case of unplanned early intake, but it is not sufficient to declare the medications safe in pregnancy. Therefore, the clear line remains: use reliable contraception, discontinue in good time if you wish to conceive, and plan the path together with your doctor.

Questions about weight loss injections, menstrual cycle, and desire to have children?

In a free 15-minute consultation, one of our doctors will address your questions about GLP-1, contraception, and family planning, without obligation and tailored to your needs.

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Conclusion

So-called "Ozempic babies" are not a coincidence or a miracle, but a logical consequence of metabolism: weight loss and improved insulin sensitivity bring back ovulation for many women. This increases fertility, often unnoticed, and contraception suddenly becomes important again.

You should take two things away from this: under tirzepatide (Mounjaro), the pill can be less effective; under semaglutide, not directly, but indirectly due to gastrointestinal issues. And if you wish to conceive, these medications should be discontinued in good time, as they are not recommended during pregnancy. It is best to clarify both points with your doctor at an early stage.

Common Questions About Ozempic, Fertility, and Contraception

Can I get pregnant while on Ozempic, even if I'm using contraception?

Yes, that is possible. According to the package insert, Ozempic (semaglutide) does not directly weaken the pill, but if you experience nausea, vomiting, or diarrhea, its absorption may be reduced. Additionally, weight loss often leads to the return of ovulation, so fertility may unexpectedly increase. With Mounjaro (tirzepatide), the pill is directly affected; here you should use condoms in addition for the first four weeks after starting and after every dose increase, or switch to an IUD or implant.

Why are women suddenly getting pregnant on GLP-1 shots?

Because the medications alter metabolism: Weight loss and improved insulin sensitivity can normalize the cycle and restore ovulation, especially in cases of overweight or PCOS. According to the German Diabetes Association, even a five to ten percent reduction in weight can be sufficient. However, GLP-1 is not a fertility drug; the effect occurs indirectly through weight and hormone balance.

Wie lange muss ich Ozempic vor einer geplanten Schwangerschaft absetzen?

Für Semaglutid (Ozempic, Wegovy) empfehlen die Hersteller, das Medikament wegen der langen Halbwertszeit mindestens zwei Monate vor einer geplanten Schwangerschaft abzusetzen. Bei Tirzepatid (Mounjaro) reicht etwa ein Monat. Wenn Du ungeplant schwanger wirst, solltest Du das Präparat absetzen und ärztlichen Rat einholen. GLP-1-Medikamente sind in der Schwangerschaft nicht zugelassen.

Sind Ozempic oder Mounjaro in der Schwangerschaft gefährlich?

Sie werden in der Schwangerschaft nicht empfohlen. In Tierstudien traten vermehrt Fehlgeburten und Fehlbildungen auf, beim Menschen fehlen große Studien. Neuere, aber kleine Beobachtungsdaten zeigten bei versehentlicher früher Einnahme kein erhöhtes Fehlbildungsrisiko, das ist beruhigend, reicht aber nicht, um die Medikamente als sicher zu bezeichnen. Deshalb gilt: konsequent verhüten und vor einem Kinderwunsch rechtzeitig absetzen.

Scientific Sources

Mounjaro (Tirzepatide), US Prescribing Information (Eli Lilly, 2022), Sections 7.2 and 12.3 on interaction with oral contraceptives.
Ozempic and Wegovy (Semaglutide), Prescribing Information (Novo Nordisk, as of 2025): no expected weakening of oral contraceptives; discontinuation in case of planned pregnancy.
Dao, K. et al. (2024). Use of GLP-1 receptor agonists in early pregnancy and reproductive safety: a multicentre cohort study. BMJ Open, 14. doi:10.1136/bmjopen-2023-083550
Fitz, V. et al. (2024). Inositol for Polycystic Ovary Syndrome: A Systematic Review and Meta-analysis to Inform the 2023 Update of the International Evidence-based PCOS Guidelines. J Clin Endocrinol Metab, 109(6), 1630-1655. doi:10.1210/clinem/dgad762
Pundir, J. et al. (2018). Inositol treatment of anovulation in women with polycystic ovary syndrome: a meta-analysis of randomised trials. BJOG, 125(3), 299-308. doi:10.1111/1471-0528.14754
German Diabetes Association (2024). Statement on altered fertility under GLP-1 receptor agonists.

About the Author

Lisa Maria Emmer

Founder · Physician · Hormonic

Lisa Maria Emmer is co-founder and medical director at Hormonic. She supports women with hormonal problems every day and specializes in cycle health, PCOS, and menopause.

Note: This article is based on current guidelines and scientific work (as of 2026). It is for informational purposes only and does not replace medical advice, diagnosis, or treatment.

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Ozempic Babies: How GLP-1 Affects Fertility and Contraception