Heart palpitations during pregnancy when lying down

Pregnancy increases the body's circulation demands, and the heartbeat may feel stronger when you are still in bed. Lying flat can feel uncomfortable as the uterus grows; some people notice improvement after turning onto their side or sitting up. Dehydration, low iron, stress, low blood sugar, thyroid problems, or an irregular rhythm such as atrial fibrillation can also contribute. The position alone does not establish the cause.

Change position slowly, try resting on your side with your upper body supported, and drink regularly unless your maternity team has advised fluid restriction. Eat regular meals and avoid excess caffeine. Note the position, gestational stage, duration, rhythm sensation, and associated symptoms. Mention recurring episodes at your antenatal appointment so your clinician can decide whether an ECG or blood tests are useful.

Seek emergency care for chest pain, fainting, severe breathlessness, collapse, or palpitations with marked weakness. Contact your maternity team or clinician promptly if the heartbeat stays fast or irregular, episodes are becoming frequent, or you have swelling, breathlessness at rest, heavy bleeding, or reduced fetal movement. Follow local maternity advice when symptoms feel sudden or severe.

Ask whether you should have a blood count and iron assessment, an ECG, or thyroid testing. Check which sleeping position, supplements, and activity level are suitable for your pregnancy, and ask what symptoms should lead you to maternity triage.