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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 you donât have an early ultrasound, you probably have to wait to hear your babyâs heartbeat at a prenatal care visit via a Fetal Doppler. Your caregiver will usually be able to find the heartbeat with this method around 12 weeks, but in some cases they will do so at 10 weeks.f you are wondering, when does a fetus have a heartbeat? Remember that you might be able to see and hear your babyâs fetal heartbeat at around 8 weeks into your pregnancy during an early ultrasound. The actual heartbeat will begin around 6 weeks along.