How long after a vaginal ultrasound can you hear the fetal heartbeat?

Patient's question:

No

Doctor's answer:

Under normal circumstances, at 5-6 weeks of pregnancy, fetal heartbeat can be observed on vaginal ultrasound or abdominal ultrasound. After 7-8 weeks of pregnancy, the fetal heartbeat becomes clearly visible on ultrasound, and the heart rate can be measured using M-mode ultrasound.