What is a fetoscope? Never heard of it.. Off to google now. Lol
Knowing that there is a heartbeat does not mean everything is fine, sometimes the heartbeat can be pathological yet because it was present the mother did not seek help
I realise that, however I would always seek help if I was concerned.

ETA: Aaah, a special type of stethoscope. Shame I couldn't hear the HB with my normal stethoscope..