19 weeks, Dr mentioned low heart rate

Hello, I have debated on asking this but Google is only making my anxiety worse ☹️ when my Dr listened to the heart beat through the doppler she mentioned it was low so she brought in the ultrasound, obviously this made me worry. She was able to see the heart and it was beating (ftm and not sure what it should look like as far as normal) she didn't mention anything else about the heart rate after that. It was super quick, and I asked several times if baby was OK and I couldnt get a yes or no answer. I had to skip my 16 week appt due to covid exposure, so 19 weeks was the soonest they could get me in. My Dr would tell me if there was something to worry about, right? She wouldn't just leave me in the dark? They said to call if I was worried about anything, and normally they don't mention this. But she was super quick and literally ran out of the room while I was asking if everything was OK. She normally says positive things, like heart rate looks good or something along those lines and i got nothing. She also didn't tell me what the heart rate was, so I can't find anything to know if everything is ok. I am so worried because I have been extremely stressed with being off work unpaid for a week(my work only pays for positive covid results, so because I was making sure it wasn't a false negative for my coworkers benefit, I was not paid) they also never asked if had any concerns or have been having symptoms to mention. Just want to know if anyone else has had this happen and everything be OK by the 20 week anatomy scan, we were going to wait until insurance kicked in but now I think we should go earlier.