6 weeks with fetal hr 81bpm told this is low should I be worried?

Marteya

I got my 6 week ultrasound saw the fetal pole and saw heartbeat and was told 81 bpm. Technician said this is cause for worry. Got another ultrasound in a week. Should I be worried? I have PCOS, I hope the hr speeds up by my next ultrasound 😔