Slow heart beat at 6 weeks (55bpm)

Hello mommies! I just want to ask if there’s a same situation like me.. I had an ultrasound yesterday I am supposed to be 8 weeks preggy but my scan result said I’m only 6 weeks and my baby’s heartbeat is too slow. My OB said I just need to maximize my medicine and have a bed rest. I will have another ultrasound after two weeks to check if it is become normal heart rate. Is there anyone here same of my situation and had a healthy pregnancy afterwards? And any advice mommies?Thank you for those who will answer! May god bless us all and give us a healthy pregnancy! #f1sTymMom