Heart palpitations as a pregnancy sign: what to know

Pregnancy changes blood flow and the body's workload, so some people notice a stronger, faster or fluttering heartbeat. Anaemia or iron deficiency anaemia, dehydration, stress, low blood sugar and thyroid problems can also contribute. Palpitations do not establish pregnancy because they have many possible explanations.

If pregnancy is possible, use an approved pregnancy test according to its instructions and contact a maternity or primary-care clinician for advice about medicines and symptoms. Atrial fibrillation is less common but may cause an irregular rhythm that needs assessment.

Note when the sensation occurs, how long it lasts, whether the rhythm feels regular, and whether you have dizziness, breathlessness or chest discomfort. Drink fluids regularly, eat at usual intervals, limit caffeine and avoid nicotine. Do not begin iron or other supplements solely because you feel palpitations.

Arrange a review if episodes repeat, interfere with sleep or activity, or begin after a medicine change. A clinician may use an ECG and blood tests, including a blood count, thyroid testing or glucose testing, depending on your history.

Seek emergency care for palpitations with chest pain or pressure, severe breathlessness, fainting, collapse, confusion or a persistent very fast or irregular heartbeat. If you are pregnant or may be pregnant, mention this when contacting a clinician so medication and testing advice can be tailored safely.

Ask which pregnancy test and timing are appropriate, whether your medicines are suitable if pregnant, and whether your symptoms need an ECG or blood tests. Mention bleeding, vomiting, reduced fluid intake, thyroid symptoms and any previous anaemia.