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A: Your baby's heartbeat is one of the first things your doctor will look for on an ultrasound, a test that uses sound waves to give off visual images of your baby and placenta as well as your uterus and other pelvic organs.
While it may be possible to detect a pregnancy as early as 5 1/2 weeks. Because the tiny sac containing the baby and its heart is so tiny, an ultrasound may not be able to detect pregnancy at this stage. If the baby can be seen at 6 to 7 weeks, their heart beat may even be detected. Between 7 and 8 weeks, the baby and their heart beat can both be detected relatively easily. After the 8th week of pregnancy the heart beat and the baby can be clearly seen.