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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.
If the doctor can't detect the heartbeat, he will most likely resort to an ultrasound to confirm that the baby is developing as he or she should. Should the doctor detect the heartbeat on the first try, he will measure the average fetal heart rate by counting how many times the heart beats in a minute.