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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.
Hearing your baby's heartbeat for the first time can be deeply moving. Keep in mind that a baby's heartbeat is much faster than an adult's. If you're in your first trimester and you can't hear your baby's heartbeat, don't worry. Dopplers can't reliably detect a baby's heartbeat until 10 to 12 weeks.Your doctor may try again on your next visit.eep in mind that a baby's heartbeat is much faster than an adult's. If you're in your first trimester and you can't hear your baby's heartbeat, don't worry. Dopplers can't reliably detect a baby's heartbeat until 10 to 12 weeks. Your doctor may try again on your next visit.