Ultrasound measure 6weeks 1 day, heart rate 90

Lana

I had my first ultrasound today measuring 6 weeks 1 day and based off LMP i would be 6 weeks 3 days. The heartbeat was 90. The doctor i saw after the ultrasound told me that the heartbeat was really low and that it was likely a sign of a nonviable pregnancy. They scheduled me another ultrasound for next week. Should I stress about an MC? She made me feel awful and now I’m freaking that there is something wrong with baby.