Early ultrasound?

K

Hi there! So I’m 5 weeks exactly tomorrow. I had my HCG drawn last week and it was high 400’s. Had it drawn again today and it was 7692. Doc wants me to come in for a ultrasound on Friday and said my HCG with how it’s going should be close to 15,000 by then and we should see a heart beat…but according to my due date calculated by my period I’d only be 5 weeks and 1 day by then? Seems to early to see a heart beat.

But I looked online and seems to be a thing that after 10,000hcg it’s visible? Anyone have something similar happen?