'Ozempic babies' are real — here's what doctors want you to know about fertility and GLP-1 drugs

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"Ozempic babies" has become the internet's shorthand for surprise pregnancies among people taking GLP-1 drugs like Ozempic and Wegovy . Scroll TikTok and you'll find plenty of people sharing their positive pregnancy tests just months after starting one of these medications. The usual explanation is that GLP-1 drugs boost fertility, and for some people, they do help ovulation return. But fertility doctors point to a second factor that gets far less attention: tirzepatide, the drug in Mounjaro and Zepbound , can make birth control pills less effective, especially in the first weeks of treatment. If you're trying to get pregnant, that first part may sound like good news, but there are a couple of catches you need to know about. And if you're not trying to get pregnant, the second part is the one to watch. We asked four reproductive endocrinologists what's really going on and what to do about it.

Why Mounjaro and Zepbound can make the pill less reliable

Tirzepatide, the active ingredient in Mounjaro and Zepbound, "delays gastric emptying, particularly when treatment is first started," says reproductive endocrinologist Dr. Lucky Sekhon , an assistant clinical professor at the Icahn School of Medicine at Mount Sinai. "That can change the rate and extent at which an oral medication is absorbed." Put simply, birth control pills may be less effective, especially in the first few weeks.

In fact, the Food and Drug Administration (FDA) labels for both Mounjaro and Zepbound state that after a single dose of tirzepatide, about 20% less of certain birth control hormones reached the bloodstream. That's why the labels advise switching to a non-oral contraceptive method, or adding a barrier method like condoms, for four weeks after starting tirzepatide and again after every dose increase. That second part catches people off guard, since doses go up "in steps every few weeks," says Dr. Deborah Ikhena-Abel , a reproductive endocrinologist in Austin.

Do Ozempic and Wegovy have the same effect?

Not as far as studies show. While semaglutide, the active ingredient in Ozempic and Wegovy, slows digestion too, it hasn't been shown to make the pill less effective, according to a 2026 review in JBRA Assisted Reproduction . "Medications within the GLP-1 family can have different pharmacokinetic effects," Sekhon says, "so we shouldn't assume that an interaction demonstrated with one drug automatically applies equally to another." That said, Foundayo , a newer daily GLP-1 pill , carries a precautionary backup warning on its label, though its effect on the pill hasn't been studied.

Still, some doctors, including Dr. Ilana Ressler , a reproductive endocrinologist at Illume Fertility in Norwalk, Conn., suggest "erring on the side of caution" and switching to a non-oral method or adding condoms with any GLP-1 drug, at least at first. Here's why:

Side effects can get in the way. Common GLP-1 drug side effects like vomiting and diarrhea can keep a pill from being fully absorbed.

Your ovulation may come back. "Patients whose ovulation improves during treatment may become pregnant sooner than they expect," Ressler says. (More on this below.)

Sekhon calls that "a precautionary, individualized recommendation rather than evidence that every GLP-1 has been proven to reduce birth control absorption." And if you're using an IUD, implant, patch or vaginal ring, this doesn't apply to you since they don't rely on digestion to work.

The "Ozempic babies" all over your Reels tell only part of the story. A 2025 study in PLOS One compared social media chatter about GLP-1 drugs and fertility with scientific literature and found a real gap: of 52 original studies on GLP-1 receptor agonists and fertility that turned up in a PubMed search, every single one was conducted in women with polyendocrine metabolic ovarian syndrome, or PMOS (formerly polycystic ovary syndrome, or PCOS). Not one studied women without the condition.

That doesn't mean the excitement is baseless. It simply means it's specific.

"Women with PMOS have insulin resistance," explains Ikhena-Abel. That drives up testosterone and other androgens, disrupting communication between the brain and the ovaries. The result: follicles, "the small sacs where eggs develop, are arrested and unable to mature and release an egg," she says.

Weight loss, through GLP-1 use or otherwise, lowers insulin levels and can reverse that chain reaction. "Some patients experience more regular cycles and conceive naturally after starting GLP-1s due to more regular ovulation," Ressler says. In fact, in a 2017 randomized trial of 176 women with PMOS and excess weight, nearly 44% of those who took an older GLP-1 for 12 weeks got pregnant without fertility treatment, compared with about 19% of those who took metformin, a common diabetes drug often prescribed for PMOS. Still, Ressler cautions, "GLP-1s are not specifically fertility medications, and we cannot assume they will improve everyone's chances of pregnancy."

In short, GLP-1 drugs may help improve fertility by addressing some of the problems getting in the way.

Can GLP-1 drugs help if you don't have PMOS?

Outside of PMOS, the picture gets murkier. "There's a reason to think a GLP-1 could help some people who do not have PMOS, but it depends on why they are not ovulating," says Dr. Asima Ahmad , a reproductive endocrinologist in Chicago and chief medical officer of Carrot Fertility.

One common culprit: excess weight itself. Body fat produces estrogen, and too much of it can interfere with the hormone signals that tell your ovaries to mature and release an egg, Ahmad explains. As a result, ovulation may happen only sporadically or not at all, making it harder to get pregnant. Even modest weight loss can help: Doctors commonly recommend losing 5% to 10% of body weight for people whose fertility is affected by obesity, according to a 2026 review in Scientific Reports .

Ahmad points to a study that's nearly three decades old in which 60 of 67 women with obesity and infertility, across a range of diagnoses, resumed spontaneous ovulation after a structured weight loss program — no GLP-1 drugs involved. That study wasn't randomized, she notes, so she wouldn't promise the same result to everyone.

"The most important thing before any recommended treatment, whether that is weight loss or something else, is determining the cause of ovulatory dysfunction," Ahmad says. Irregular ovulation can also stem from thyroid disease , high prolactin, under-eating, overexercising, extreme stress, perimenopause or primary ovarian insufficiency, causes that a GLP-1 wouldn't necessarily address.

Perhaps. Research presented at the Endocrine Society's 2026 annual meeting suggests that testosterone levels and sperm parameters among men with obesity may improve with GLP-1 drugs. The caveats: The gains were clearest in men with low testosterone, and they mostly accompanied weight loss. "When healthy men without obesity were studied, no benefits were seen," Ikhena-Abel says.

Overall, the research on men remains "inconclusive," according to the 2026 JBRA review . In fact, in one case report, a man's sperm quality dropped with the older GLP-1 drug liraglutide (Victoza) and recovered after he stopped.

Either way, doctors say a male partner's prescription belongs in the fertility conversation. "Both partners' medications and medical histories are relevant when it comes to fertility," Ressler says.

Planning a pregnancy on a GLP-1? Here's what to do

If you're taking a GLP-1 drug and hoping to get pregnant, planning ahead matters: You generally "must discontinue use prior to pregnancy," Ressler says. "Animal studies have raised concerns about fetal growth, pregnancy loss and developmental abnormalities, while human data is still too limited to establish safety," Ahmad says. Plus, weight loss by any means isn't recommended during pregnancy, she adds. That's why the guidance is to stop before you start trying, not after a positive test. And because some of these drugs stay in the body for weeks, how far ahead you need to stop depends on which one you take:

*The labels for tirzepatide and liraglutide don't specify a preconception stop window. The tirzepatide range reflects guidance from Dr. Ilana Ressler and a 2026 review in JBRA Assisted Reproduction . The liraglutide window comes from the same review.

Sources: FDA labels for Ozempic , Wegovy , Rybelsus , Mounjaro , Saxenda and Foundayo ; MotherToBaby ; JBRA Assisted Reproduction ; Dr. Ilana Ressler

For men planning to become dads, the advice differs. "There's currently no established paternal stop window when it comes to GLP-1 use," Ahmad says. That doesn't mean it's been proven safe. There's simply little research on whether these drugs reach semen.

What if you get pregnant while taking a GLP-1?

"Don't panic," Ahmad says. She cites a 2026 analysis of more than 40,000 pregnancies exposed to GLP-1 drugs, which found no clear rise in birth defects. And in a separate 2026 study of 3,572 pregnancies in the Annals of Internal Medicine , people who kept taking a GLP-1 into early pregnancy didn't have a significantly higher risk of miscarriage. Their rates of major birth defects weren't significantly higher either, though the researchers say that finding is less certain.

Neither study proves these drugs are safe throughout pregnancy, but both are reassuring for the kind of accidental early exposure that's likely behind many of these headlines. Still, Ahmad says, you should stop GLP-1 use , call your prescriber and start prenatal care. If you have diabetes, you'll also need a plan to keep your blood sugar in check once you stop. And if you plan to breastfeed and resume GLP-1 postpartum, talk to your provider first: Ozempic's label notes that "it is not known if Ozempic passes into your breast milk."

GLP-1 drugs can affect fertility, but they're not fertility treatments. And don't skip backup birth control just because you think your odds are low. If you're on a GLP-1 and pregnancy is anywhere on your radar, whether you're trying for it or actively avoiding it, bring it up at your next appointment, not after the fact. "The key is individualized preconception planning rather than treating GLP-1 use and reproductive health as two separate conversations," Sekhon says.

Lucky Sekhon , MD, board-certified reproductive endocrinologist, infertility specialist and ob-gyn, and assistant clinical professor at the Icahn School of Medicine at Mount Sinai

Deborah Ikhena-Abel , MD, board-certified reproductive endocrinologist, infertility specialist and ob-gyn at Aspire Fertility in Austin

Ilana Ressler , MD, board-certified ob-gyn and reproductive endocrinologist at Illume Fertility in Norwalk, Conn.

Asima Ahmad , MD, board-certified ob-gyn and reproductive endocrinologist, and chief medical officer of Carrot Fertility

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