JorideC,

I wouldn't worry too much if you saw bubs and there is a hb.
I went for my first u/s, which I thought I would be 9 weeks but I was only 7.5 weeks. I had another u/s recently and I was 9.5 weeks, which was approx two weeks after the first one

If your obs was ok with the u/s, I wouldn't be too concerned. If you are really worried, call them back and see if you can get another appt.