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A transvaginal ultrasound can detect a heartbeat with very high accuracy as early as six or seven weeks into a pregnancy. If performed properly, the results are considered accurate and reliable.
A Doppler can start to pick up a heartbeat at around 10-14 weeks into your pregnancy. A stethoscope can be used to hear the baby's heartbeat late in the pregnancy. * If you have an early scan it can be seen from about 6 weeks.onfidence votes 648. The baby's heart beat can be seen on an ultrasound at around 7 weeks, and if you are very slim MAY be heard on a Doppler from 9 or 10 weeks. Here is more advice and input: * Most Heartbeats can be heard by 15/16 weeks.