Still measuring small.

Had my first.

Ultrasound at , 5 weeks and 5 days was supposed to be 6 weeks but I measured 5 weeks and 5 days had another ultrasound. After that I was supposed to be 8 weeks. But measured 6 weeks and 4 days. The heartbeat was 101. Got into a really bad car accident today. I'm supposed to be 7 weeks and 1 day so I got an ultrasound since I'm pregnant and the car was totaled. I'm measuring 6 weeks and 5 days with a heartbeat of 150. Has anyone ever gone to this and not? Had a miscarriage. I am getting seriously concerned. I feel like the baby's not growing but the heart is. I don't know what else to do and I don't have a Doctor's appointment until mid January. I keep going to these clinics and they can't tell me anything. I'm so nervous somebody please tell me. I won't be losing this baby. Please tell me there's a different like situation. Going on right now. Like what could this be?I can't see my OB until next month. It's like the heart beat. Gets stronger and the baby's growing a couple days a week, but it's like the baby's still not growing last Friday. I was measuring 6 weeks and 4 days and today I'm being told I'm 6 weeks and 6 days or 5 days.