I think this happens to most people at some stage. I know I said the exact same thing to my OH at around the 6 week stage. I felt fine all of a sudden and was worried it was a bad sign. It's different for everyone and not all days will be exactly the same. I bet you will be back to your nauseous self soon, It's easier said than done(I know) but try not to worry.
I second EB on this one...d ms can come and go to varying degrees(mine was on/off wk 6-14).Once u haven't had bleeding/spotting u should have no concern,however why not take a trip to doc/midwife to put ur mind at ease.
Let us know how u go
thanks girls xxx
wrap urself up n bubble wrap Windycity 4d next 7/8months odd!!!!!lololol