should I be concerned

Shari

I ended up at the ER yesterday for sever dehydration after three days of throwing up. they did an ultrasound to check on baby. I'm 8 weeks according to my last cycle but baby is measuring 6 weeks 4 days. Heartbeat was 129 too. should I be concerned about the growth of the baby? it's been many years since I had a baby and don't remember if baby was smaller than expected.