Hi, I had my first scan today, I was feeling anxious as I had a miscarriage in January but was elated to see a gestational sac, yolk sac and even a baby bean pole. The first day of my last period was Feb 19 so I had put myself at 7 weeks, but the ultrasound puts me at 5wks and 5 days which is odd, has this happened to anyone else?

More concerning, the heartbeat was 84bpm which is low so now I'm feeling even more anxious. Has anyone experienced this in their scans?

Thankyou!