don't feel pregnant!!

I'm almost 18 weeks pregnant and I do not feel pregnant at all! I'm actually kind of worried because I felt the first little flutters last week and then nothing since. Also, normally when I lay in any position other than on my sides I immediently get nauseous and haven't gotten that. My belly has not changed in about three weeks and the only thing I have still experienced is nausea and vomiting. No I'm not bleeding but my next appointment isn't for another week. Someone please tell me this is normal!