So after telling my doc I was testing pregnant he sent me for an ultrasound when I thought to be 4-5 weeks. Well, the scan didn't show anything..not even a sac. The tech told me I was just too early to see anything. My doc now wants me to go back in a few weeks as he thinks the hcg level was low (769 which is in normal range for 4-5wks). Has anyone had a scan where thy didn't see anything and later it was fine? I just need a little reassurance. .