Can You Get Pregnant While Taking Weight Loss Injections? (October 2026)

01 · The core answer

Can you get pregnant while taking weight loss injections?

Yes, you can. Nothing about a weekly injection prevents ovulation or conception, so pregnancy remains possible for anyone who is fertile and having unprotected sex. Mounjaro is a weight management medicine, not a contraceptive.

What matters is what you do next. Mounjaro must not be used during pregnancy, and it should be stopped at least one month before trying to conceive.¹ That is the licensed position, and it is the one our prescribing team follows. For a deeper look at the brand-specific question, see our guide on whether you can get pregnant on Mounjaro.

Other weight loss injections have their own leaflets and their own stop-before-conception advice. Check the patient information leaflet for your specific product and ask your prescriber, rather than assuming the Mounjaro timing applies to everything.

02 · Your situation

What to do, depending on your situation

Most readers fall into one of four groups.

If you are unsure which row applies, pause and ask. A short conversation with a prescriber costs nothing, and our free online consultation lets you flag fertility plans before any treatment starts.

03 · If you are starting treatment

Starting treatment when pregnancy is possible

If you are of childbearing age, your consultation should cover contraception and any plans to conceive. Every order is reviewed by a GPhC-registered prescriber, not a scoring script.

Related guide: Buy Mounjaro.

04 · Contraception and the pill

Contraception while on Mounjaro

The pill is the one contraceptive that Mounjaro can affect. Mounjaro slows stomach emptying, which can reduce how well oral contraceptive pills are absorbed.¹

The SmPC advises switching to a non-oral method, or adding a barrier method such as condoms, for 4 weeks after starting Mounjaro and for 4 weeks after each dose increase.¹ The MHRA publishes guidance on the same point.⁷

This applies to the pill only. Implants, coils and injections are unaffected.¹

Because you step up the dose over several months, the extra-protection windows come around more than once.

• The first 4 weeks after your first 2.5mg dose.
• The 4 weeks after moving to 5mg.
• The 4 weeks after each further step: 7.5mg, 10mg, 12.5mg and 15mg.

Note that the dose ladder starts at 2.5mg, then 5mg after at least 4 weeks, then steps of 2.5mg at minimum 4-week intervals up to 15mg.¹ Tell your prescriber which method you use and they can advise on the safest approach for you.

05 · Planning to conceive

Planning a pregnancy after weight loss injections

If you want to conceive, stop Mounjaro at least one month before you start trying.¹ Tirzepatide has a half-life of about five days, so after a final dose it takes roughly 4–5 weeks to clear the system. There is no way to speed this up, and nothing needs doing while it clears.¹

That clearance period lines up with the one-month guidance. Use contraception until you and your prescriber agree the timing is right, rather than stopping the injection and relying on luck.

Stopping treatment has consequences for weight: in SURMOUNT-4, people who stopped tirzepatide after 36 weeks regained on average 14% of body weight over the following year, while those who continued lost a further 5.5% on average. Stopping should always be planned with your prescriber, with diet and activity habits ready to carry the load.

Our guide to getting pregnant after weight loss injections covers the period after you stop in more detail.

06 · Fertility and PCOS

Fertility, PCOS and the "Ozempic baby" idea

The term "Ozempic babies" describes unplanned pregnancies in people using weight loss injections. Ozempic is semaglutide licensed for type 2 diabetes. It is not a UK weight-loss medicine, and prescribing it privately for weight loss is off-label.

Mounjaro is not licensed specifically for PCOS, but many women with PCOS meet the licensed weight-management criteria. Weight loss itself is a first-line recommendation that can improve insulin resistance, cycles and symptoms, and improving weight can restore ovulation.¹¹

In practical terms, if your cycles were irregular and become more regular, you may ovulate when you previously did not. That is a reason to take contraception seriously from the start, even if you believed pregnancy was unlikely.

If fertility is a concern, raise it in your consultation so your prescriber can look at your history. Mention PCOS and any fertility plans at the outset.

07 · If you get pregnant

What happens if you get pregnant on treatment

If you become pregnant during treatment, stop the medicine and tell your prescriber promptly.¹

A sensible sequence looks like this:

• Do not take another dose.
• Confirm the pregnancy with a test and contact your prescriber, who can note it on your record.
• Book an appointment with your GP or midwife so antenatal care starts early.
• Keep your pen and packaging, as your clinician may ask which doses you took and when.

Mounjaro must not be used during pregnancy, so continuing is not an option.¹ A GP or obstetric team can give you personalised advice and reassurance.

You can report any suspected side effect, including exposure in pregnancy, through the MHRA Yellow Card scheme.¹⁹ For a fuller walk-through, see what happens if you get pregnant on Mounjaro.

The same principle holds for other injections. If you have become pregnant on Ozempic or Wegovy, read your product's leaflet and speak to your prescriber promptly.

08 · Breastfeeding

Breastfeeding and weight loss injections

Current prescribing information indicates minimal transfer of tirzepatide into breast milk.¹ That is not the same as saying everyone should use it while breastfeeding.

Discuss breastfeeding with your prescriber so the decision reflects your circumstances, including your baby's age, your own health and your reasons for wanting treatment. If you are planning another pregnancy after breastfeeding, mention that too, because it affects when you would need to stop.

09 · NHS or private route

NHS or private: getting treatment when pregnancy is on your radar

Mounjaro is available on the NHS, but access is being phased in over several years. NICE recommends it for adults with a BMI of at least 35 plus at least one weight-related condition, and the NHS primary-care rollout began in June 2025 with the highest-need groups first, initially BMI 40+ with four or more qualifying conditions.⁴⁶ Full rollout is expected to take years.

Many people who meet the licensed criteria therefore choose regulated private treatment. Whichever route you take, the pregnancy advice is identical. If you want to understand NHS routes, read how to get referred for weight loss injections.

If you are weighing up options, our overview of all weight loss treatments and our page on weight loss injections explain what is available.

10 · How ordering works

How ordering works

Ordering takes three steps, and you can raise pregnancy plans at the first.

• Free online consultation. A short health questionnaire, no charge and no obligation. Tell us about contraception and fertility plans here.
• Prescriber review. A GPhC-registered prescriber reviews it.
• Dispensing and delivery. Our registered pharmacy dispenses it, with free next-day tracked delivery in discreet, temperature-controlled packaging.

Our Mounjaro comes through official LillyDirect supply, direct from Eli Lilly's UK distribution. Ongoing monthly reviews are included, and repeat orders re-check suitability with no auto-shipping, so a change in your pregnancy plans can be picked up before your next pen. When you are ready, you can start with our free online consultation.

Mounjaro (tirzepatide) is a prescription-only medicine, supplied only after an online consultation reviewed by a GPhC-registered prescriber. Individual results vary. This page is information, not a substitute for medical advice.