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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.
I was told by my doctors that 6 weeks was too early to hear a heartbeat. Even at 9-11 weeks pregnant it is often difficult. If using an ultrasound, they should be able to monitor heart activity visually though. They can begin monitoring heart activity visually at around 5 weeks.