1st Ultrasound measures small & slow heartbeat

Had first Ultrasound today. I should be 7 wks 6 days based on date of ovulation and date of last period, but baby measured at 6 weeks 4 days. Heartbeat was only 105, which is much lower than normal at this stage. Now we sit and wait till another ultrasound next week...I’m feeling very defeated as this month marks a year since I had a full molar pregnancy, and I was VERY ready for some good news.

Has anyone in this group had a similar experience and gone on to have a healthy pregnancy and baby? In need of some positivity!