When will baby move?!?

Lindsey
I'm a week into my second trimester and I've been feeling so great. I used to feel my baby a little bit in the beginning, a couple of times huge flutters, now i can't feel anything, and I want so much to know he/she is ok in there! I know it probably is, but as first time mom, I really want to feel my baby to make sure. When did you really start feeling your baby move? I'm 15 weeks today. And what does it feel like?