--- title: "Ozempic, Wegovy and your cycle: what GLP-1 drugs do to your hormones" description: "More and more women on GLP-1s report changed cycles, unexpected pregnancies or returning ovulation with PCOS. What do we actually know, and what's speculation?" url: https://myperiod.app/en/blog/ozempic-glp1-en-je-cyclus lang: en date: 2026-07-05 publisher: PERIOD. B.V., Amsterdam --- [Back to blog](https://myperiod.app/blog) [Lifestyle](https://myperiod.app/blog/categorie/lifestyle) · 6 min read # Ozempic, Wegovy and your cycle: what GLP-1 drugs do to your hormones [Lees dit artikel in het Nederlands](https://myperiod.app/blog/ozempic-glp1-en-je-cyclus) PERIOD. team · July 5, 2026 GLP-1 medications like semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro, Zepbound) are among the most-discussed medical developments of 2024-2026. Beyond weight loss, users increasingly report *cycle changes*, sometimes welcome, sometimes surprising. ## What happens in the body GLP-1s change how your body regulates glucose, insulin and satiety. In women with **insulin resistance or PCOS**, those changes can indirectly affect the cycle: less insulin resistance → lower androgens → sometimes ovulation returns after years of absence. In others, rapid weight loss itself temporarily disrupts things. ## Most commonly reported cycle effects - **More regular cycles** in PCOS, sometimes within a few months. - **Return of ovulation**, hence the "Ozempic babies" term: unexpected pregnancies in people who thought they weren't fertile. - **Shorter or irregular cycles** during rapid weight loss. - **Temporary loss of periods** in large calorie deficits or undernutrition (hypothalamic amenorrhea). - **Heavier or lighter flow** in the first months. ## Ozempic babies: not a myth The term "Ozempic babies" went viral in 2024. What's actually going on: - **PCOS + weight loss** can restore ovulation, long known, regardless of the drug. - GLP-1s can affect absorption of **oral contraceptives** via slowed gastric emptying and (at higher doses) nausea/vomiting. For tirzepatide (Mounjaro) the manufacturer specifically advises a non-hormonal or additional method for 4 weeks after starting and after any dose increase. - Unexpected fertility = a risk if you don't want to get pregnant. > This isn't medical advice. Always discuss contraception and cycle changes with the doctor prescribing your GLP-1, and with your GP or gynecologist. ## Planning pregnancy while on GLP-1s The official guidance is: **stop semaglutide 2 months before a planned pregnancy**, and tirzepatide 1 month before. There is not yet enough data on safety during pregnancy. If you become pregnant unexpectedly: contact your doctor right away. ## What your cycle app can do here If you start (or stop) GLP-1s, it helps to log the first 3-6 months carefully: cycle length, flow, symptoms like nausea, energy and mood. If your doctor wants to adjust something, you'll have concrete data. PERIOD. predicts from *your* pattern and adapts, instead of clinging to a generic 28-day assumption. ## When to reach out - 3+ months with no period for no clear reason. - Very heavy bleeding. - Suspected pregnancy. - Cycle change + dizziness, extreme fatigue or hair loss (possible signs of losing weight too fast). ## Why this data is especially sensitive The combination of GLP-1 use, weight and cycle data is *extremely* valuable to insurers, advertisers and data brokers. At PERIOD. it stays encrypted on EU servers, with no ad trackers, and we don't sell it to anyone. Read: [a cycle app that doesn't sell data](https://myperiod.app/blog/cyclus-app-zonder-data-verkopen) and [PCOS explained](https://myperiod.app/blog/pcos-uitleg-symptomen). [Download PERIOD. on the App Store](https://apps.apple.com/us/app/period-cycle-period-tracker/id6757947793) · [via Google Play](https://play.google.com/store/apps/details?id=app.myperiod.android). Want to understand your cycle better? ## Keep reading [Menstrual cup, tampon or period underwear: which suits you?An honest comparison of menstrual cups, tampons, pads and period underwear: capacity, cost, wear time, safety and environmental impact. No marketing spin.Read more](https://myperiod.app/en/blog/menstruatiecup-tampon-of-period-underwear)[Supplements for PMS: what actually works, according to research?Calcium, vitamin B6, magnesium, vitamin D, omega-3 and chasteberry: how strong is the evidence for each in PMS, and where to be careful.Read more](https://myperiod.app/en/blog/supplementen-bij-pms-wat-werkt-echt)[Tracking your cycle with a smartwatch or ring: how accurate is it?Apple Watch, Oura and other wearables measure skin temperature during sleep to estimate ovulation. What they can and can't do, and what happens to that data.Read more](https://myperiod.app/en/blog/cyclus-tracken-met-smartwatch-of-ring)