12 Weeks Pregnant: Things to Avoid
At 12 weeks, you're right at the edge of the first trimester, and while the miscarriage risk drops considerably around now, the day-to-day safety rules you've been following still apply. Here's a clear rundown of what to keep avoiding, and why it still matters even as the riskiest early weeks pass.
Food and drink to avoid
The food safety guidance that applied at 6 weeks applies just as much at 12 — nothing changes here as you move through the first trimester.
- Unpasteurised soft cheeses (like brie, camembert, and soft blue cheeses) and pâté, due to listeria risk.
- Raw or undercooked eggs, meat, and fish, including cured meats unless cooked through.
- Liver and liver products, which are very high in vitamin A — too much can be harmful to your developing baby.
- Alcohol — there's no proven safe amount in pregnancy, so the safest approach is to avoid it completely.
- High-mercury fish such as shark, swordfish, and marlin, and no more than two portions of oily fish a week.
- Caffeine, kept under 200mg a day (roughly one mug of instant coffee, or two mugs of tea).
Lifestyle and activity
- Smoking and vaping are best avoided throughout pregnancy — ask your midwife or GP about NHS stop-smoking support if you need help.
- Hot tubs, saunas, and steam rooms should be avoided, as raising your core body temperature isn't recommended in pregnancy.
- Contact sports, activities with a high fall risk, and scuba diving aren't advised, though most gentle to moderate exercise is fine and encouraged.
- Always check with your GP, pharmacist, or midwife before taking any new medication, including over-the-counter remedies and supplements — not everything that's fine outside pregnancy is fine during it.
- Heavy lifting or straining should be approached with more caution than usual, particularly if it causes discomfort.
What's changing around 12 weeks
Once you're past your 12-week scan, the statistical risk of miscarriage drops significantly compared with earlier weeks, which is a big reason many people choose to share their pregnancy news around now. That said, "lower risk" isn't "no risk," and none of the safety guidance above is time-limited to the first trimester — it continues to apply for the rest of your pregnancy. What may genuinely start to ease is how you're feeling day to day, with nausea and fatigue often beginning to lift for many people around this point.
Frequently Asked Questions
Can I relax any of the rules once I'm past 12 weeks?
No — food safety, alcohol, and smoking guidance apply throughout the whole of pregnancy, not just the first trimester. What does change is the statistical miscarriage risk, which drops noticeably after the 12-week scan, but that's a change in risk level, not a green light to ease off on safety precautions.
Why do so many people announce their pregnancy at 12 weeks?
After the 12-week (dating) scan, the risk of miscarriage falls considerably compared with earlier in pregnancy, which is why many people wait until after this scan to share their news more widely. It's a personal choice, though, and there's no medical requirement to wait until any particular point.
Is it safe to increase my exercise at 12 weeks?
If you were already active before pregnancy, you can generally continue with most forms of exercise, adjusting intensity as needed and avoiding contact sports or activities with a high fall risk. If you're newly starting exercise in pregnancy, gentle activities like walking or swimming are a sensible place to begin — speak to your midwife if you're unsure what's appropriate for you.
This article is for informational purposes only and does not constitute medical advice.
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