Hey,
My symptoms more or less all vanished at 8 weeks and i was terrified as i'd had 2 m/cs, but my baby arrived perfectly healthy 11 days late so it was obviously nothing to worry about. Try not to worry too much, maybe see if your scan can be moved if you're panicking and really, pretty soon you'll notice a tiny bulge (in the mornings is when i could see mine, by around 12 weeks) which i found comforting as bubs was obviously still there and growing.

HTH
Hana