Can something still be wrong if they hear the heartbeat?

I had a normal doctor’s visit today where they check my breasts and cervix and all that. The nurse was happy with the heartbeat they found with the Doppler (they found it fast and it was 165) and she said my cervix was closed. But then the doctor came in and was very adamant that I come in if there was any bleeding like he was expecting it to happen and asked twice if I’ve had any bleeding. 🫤 I’m 11 weeks tomorrow so kind of just concerned now. I didn’t want to look stupid but asking questions