Opinion pls

Shania

I had a ultrasound 3 days ago for my 6 weeks scan and we saw the sac and yolk but no baby yet . My doctor got me to get another blood test to check if it's a viable pregnancy and i had it done yesterday and it is at 20764 and about a week ago it was 3180 so its done a big jump obviously. Would you say it was just tp early to see the baby via stomach ultrasound and i should see it at my 8 week . Is 20764 a good number for 6 weeks ?