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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.
It's known as your resting heart rate, as long as you've been resting for at least five minutes before checking your pulse. You can also check if your pulse is regular or irregular by feeling its rhythm for about 20-30 seconds. Occasional irregular heartbeats, such as missed beats, are very common.