(by the way, how come they even checked your HCG levels so far along? most docs don't check it after the initial confirmation unless you have bleeding..)
I was just wondering the same thing. I was never told my hcg levels with either pregnancy and didn't have blood tests except to confirm pregnancy. My gp wasn't even going to do that test with DS2 as he said the urine tests are accurate enough.

Try not to worry now. The ultrasound showed a healthy baby and pregnancy.