My HR has always tended to low, we had to time it in biology class and the teacher told me I mustn’t have done it right but I now know I did. I was still prescribed a beta blocker for migraine and that pushed it down further, so I went from 50ish bpm average to under 40. I didn’t feel ill though and presume I’m okay as my ecg was fine. It’s a good idea to have your heart checked out to be careful though although I wouldn’t be too worried.