Why Pregnancy Changes the Picture for Weight Loss Injections
Mounjaro and Wegovy are prescription-only medicines. Both act on appetite-regulating pathways in the body — Wegovy (semaglutide) targets GLP-1 receptors, while Mounjaro (tirzepatide) acts on both GLP-1 and GIP receptors. Outside of pregnancy, many people find them helpful for managing weight under clinical supervision. During pregnancy, however, the safety profile changes significantly.
What the guidance says
According to NHS guidance and the medicines' official product information, neither tirzepatide nor semaglutide is recommended for use during pregnancy or breastfeeding. If you become pregnant while taking one of these medicines, you should contact your prescriber or doctor promptly. They will advise on whether and how to stop, and what to monitor. This is not a decision to make on your own, and you should not simply stop or continue without speaking to a healthcare professional first.
If you are trying to conceive
If you are planning a pregnancy, it is important to have a conversation with your prescriber or doctor before conception. They will advise on how far in advance of trying to conceive you may need to stop, based on your individual circumstances and the medicine you are taking. The official patient information leaflet that came with your pen, as well as the electronic Medicines Compendium, contains specific guidance — your prescriber can walk you through it.
Reporting side effects or concerns
If you experience any unexpected symptoms or reactions while pregnant and taking one of these medicines, contact your healthcare professional promptly. Side effects can also be reported to your national reporting scheme — such as the UK's Yellow Card scheme — though your first step should always be speaking to a healthcare professional directly.
For a broader overview of how weight loss injections work and what to expect, see our guide to weight loss injections. You may also find it useful to read about what a weight loss jab involves more generally, or about Mounjaro as a weight loss jab if that is the medicine you have been prescribed.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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How GLP Trackr Supports You Through Treatment Changes
When your treatment situation changes — whether due to pregnancy, a planned pause, or any other reason your prescriber advises — keeping accurate records becomes even more important. GLP Trackr's dose logging feature lets you record every injection: the date, dose strength, and which medicine you are taking. That log becomes a clear, ready-to-share summary when you speak to your prescriber or doctor.
The app's side-effect tracker is equally useful at a time like this. If you have been logging symptoms — nausea, fatigue, changes in appetite — over time, you have a detailed picture to bring to your appointment rather than trying to recall everything from memory. GLP Trackr can generate a summary of your tracked journey that makes those conversations more informed and less stressful.
If you have been using navigating pen availability as part of your journey, keeping your dose history logged also means you have an accurate record of what you have taken, which matters if your treatment is paused and later restarted under your prescriber's guidance.
Important: GLP Trackr is a tracking and journaling app — it is not a medical service, and nothing in the app or on this page constitutes medical advice. If you are pregnant, think you might be pregnant, or are trying to conceive while taking a weight loss injection, please contact your prescriber or doctor promptly. They know your full medical history and are the right person to guide you.
Ready to keep your journey organised and your records clear? Download GLP Trackr on the App Store or Google Play and start a free 7-day trial — so your next prescriber conversation is as informed as it can be.
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Morning Check-In
Start every day with a 60-second wellness check-in. Log how you're feeling, track nausea, appetite, energy, and mood — giving you and your care team a complete picture of how your medication is working.
Injection Tracking
Log every dose with a single tap. Track your dose history, phase in your cycle, estimated medication levels, and upcoming injection dates — with reminders so you never miss a scheduled shot.
Hydration Reminders
Staying hydrated is especially important on GLP-1 medications. Set daily water targets, log intake throughout the day, and receive smart nudges when you're falling behind your goal.
Smart Meal Planning
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Progress Analytics
Beautiful, easy-to-read charts show your weight loss trajectory, weekly nutrition trends, medication responses, and wellbeing scores over time — turning raw data into genuine insights.
AI Meal Scanning
Snap a photo of any meal and get a full nutrition breakdown in seconds — calories, protein, carbs, fat, and fibre. No searching. No manual logging. Just point, snap, and track.
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Log walks, workouts, and movement with activity targets that flex with your energy levels. On lower-energy dose days, gentler targets keep you moving without burning out.
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Frequently asked questions.
Current guidance advises against using Mounjaro or Wegovy during pregnancy. If you become pregnant while taking either medicine, contact your prescriber or doctor promptly. They will advise whether and how to stop — this decision should never be made without professional guidance.
The timing will depend on which medicine you take and your individual circumstances. Your prescriber or doctor is the right person to advise you. Check the patient information leaflet that came with your pen and speak to your healthcare professional before trying to conceive.
Mounjaro and Wegovy are not currently recommended during breastfeeding. If you are breastfeeding or planning to, discuss this with your prescriber or doctor before continuing treatment. Do not stop or continue without speaking to a healthcare professional first.
GLP Trackr can help you keep a clear record of your dose history and any symptoms you have tracked, which can be useful to share with your prescriber. However, the app is a tracking tool only — all decisions about pausing or stopping treatment must be made with your healthcare professional.
The patient information leaflet included with your pen is a good starting point. Your prescriber or doctor can also refer you to the official product information. For UK-based sources, the electronic Medicines Compendium (medicines.org.uk) publishes the full prescribing information for both medicines.