6 weeks 1 day- no heartbeat

Ashley
I went in for my first ultrasound today and measured at 6 weeks 1 day ( I thought I was 8 weeks). They saw the baby and the yolk sac but weren't able to find a heartbeat. I go back in a week to see if they can find it. Has anyone had this happen to them? We are so nervous. Just praying everything will be OK.