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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.
How early you can hear a heartbeat will vary slightly based upon the development of the baby. In general, using an obstetrics ultrasound, you will be able to hear your baby's heartbeat when you are about 8 weeks pregnant. Or you may be able to hear the heartbeat during regular prenatal care visit at 10 weeks, or more commonly at 12 weeks, with a fetal Doppler.