[daniel1212]

"It sounds like a heartbeat on an ultrasound, but it's not a fully-formed heart"

Meaning a heartbeat is heard from a immature heart - a heartbeat nonetheless.

[Catholic and Conservative]

Exactly.

The link below lists several citations from medical textbooks and journals that agree with you. In fact, the heart begins beating at about THREE weeks post-conception.

https://washingtonstand.com/news/fact-check-stacey-abrams-there-is-no-such-thing-as-a-heartbeat-at-6-weeks