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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.
1 Most practitioners can find the heart rate with either probe. 2  A 3-MHz probe is recommended to detect a heart rate in early pregnancy (8â10 weeks gestation). 3  A 2-MHz probe is recommended for pregnant women who are overweight.