Tornado Alley (PROG)

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The heart doesn't exist until about 9-10 weeks. The sound heard before then is created by the machine and represents electrical activity in a clump of cells. A heartbeat is the sound of operating valves, and at six weeks valves don't exist. Many articles label the sound, at six weeks, which the machine creates to make it audible as a heartbeat, but it isn't.

* At about 10 weeks to 12 weeks, the heart is formed.
https://www.babycenter.com/pregnancy/health-and-safety/when-can-i-hear-my-babys-heartbeat_10349811