Exercise in the first trimester

The early weeks of pregnancy come with a swirl of questions about movement — chiefly, “is it safe to keep exercising?” and “could it cause a miscarriage?” For most people with a straightforward pregnancy, staying active in the first trimester is not only safe but genuinely good for you. Here’s how to approach it when you’re newly pregnant, often tired and queasy.

Exercise doesn’t cause miscarriage. Let’s clear the big fear first: in a healthy, low-risk pregnancy, normal exercise does not cause miscarriage. Early losses are almost always due to chromosomal issues, not to movement, walking, or a workout. You don’t need to wrap yourself in cotton wool — keeping active is protective for your health and mood.

You can usually keep doing what you did before. If you exercised regularly before pregnancy, you can generally continue, at a sensible intensity. Use the talk test — you should be able to hold a conversation as you move. If you’re new to exercise, the first trimester is a fine time to start gently, with something like walking.

Working out around nausea and exhaustion. The irony of early pregnancy is that exercise helps energy and mood, but you often feel too rotten to do it. Be kind to yourself: some days a short walk or a gentle stretch is a win, and that counts. Move when you feel up to it, rest when you don’t, and let go of pre-pregnancy performance goals for now.

Good early-pregnancy choices. Low-impact, steady activities are ideal — walking, swimming, stationary cycling, and pregnancy-friendly yoga or Pilates with a qualified instructor. Gentle strength work is fine too. Add pelvic floor exercises from the start; your future self will thank you.

Stay cool and hydrated. Avoid getting overheated, especially in early pregnancy — drink plenty of water, don’t exercise in the heat of the day, and skip hot environments like heated studios and saunas. Wear breathable clothing and take breaks.

A few things to ease off. Don’t push to exhaustion or “train through” feeling unwell. As a general rule you’ll later avoid contact sports, activities with a real fall risk, and (from the second trimester) lying flat on your back for long — but in the first trimester, the main themes are gentleness, not overheating, and listening to your body.

When to check first, or stop. Talk to your GP or midwife before exercising if you have any complications, bleeding, a history of miscarriage or preterm birth, or other concerns. Stop and seek advice if you have vaginal bleeding, pain, dizziness, faintness, or contractions. Otherwise, movement is encouraged.

Staying active in the first trimester is safe, worthwhile, and won’t harm your baby — the real challenge is usually just feeling well enough to do it. Move gently on the good days, rest without guilt on the rough ones, keep cool and hydrated, and check in with your midwife if anything worries you. Something is always better than nothing.