Please do get checked out, OP.
This story is very rare but v recent in my family so it's worth telling in case it's relevant to you (probably not, I realise).
My 52 year old cousin (healthy, not overweight) had exactly this notification within 24 hours of buying a cheap watch for step counting. She didn't even know it had the pulse rate facility.
She had previously been to GP twice with strange symptoms (mainly fatigue and dodgy eyesight) and been fobbed off.
This notification prompted her to see a third GP. He sent her straight to hospital where they found she was in something called secondary heart block. She ended up in cardiac HDU (first person ever to walk in on their own, she was carrying a latte and feeling she was wasting their time!). Subsequently told her heart could have stopped at any moment and her coffee addiction had kept jump starting it. She had a pacemaker with built in defib fitted - was told it was urgent and would be fitted same day, then ended up waiting on the ward on complete bed rest for 4 more days as other emergencies kept coming in.
She is doing fine now, there are all sorts of reasons this could have happened apparently but they've said hers is sarcoidosis likely due to stress. She is recovering well but having lots of tests to determine treatment plan going forward, is having to take early retirement from work, etc.
Sorry if this is scary but she didn't fit the heart problem profile at all which is why it got missed. Please do get checked out just in case.