You're probably just early. My doc won't even do an ultrasound before week 8 if I'm not bleeding. Try not to worry and call if you start to bleed or get horrible cramps.
Well there's certainly no harm in waiting a few weeks to see what happens. Waiting is hard - but I think in the long run you'll be happy you took a wait and see approach.
When I had my first appointment I thought I was 7w 1d. By my Dr's calculation I was 6w 2d. He said if I had come any earlit wr probably wouldn't have been able to see anything. So I would guess you are just too early.
Is your date based on last period or scan measurement?
Its based off my last period
OK well you may be less than 6 weeks in that case. The hcg is rising well so i'd try not to worry and go back for another scan in a couple of weeks.