Actually the date of heartbeat-cessation is something of a side issue (and yes, I know I was the one who brought it up!) because the real question is: if a pregnancy - i.e. a living fetus - endangers the life of the mother, it should be terminated. IMO.

She was found to be miscarrying - which sounds like the child was never going to be born anyway. And what shape would it have been in if it had been?