I'm currently 21 weeks and I feel her move everyday, usually first think and in the evening.
This morning I didn't feel her and I freaked out a bit. It also made me wonder, do you reach a stage where you feel your baby moving all the time, I.e., when they're bigger and have less wiggle room?
I made the foolish mistake of thinking there'd be less to worry about at this stage. There's always something, isn't there?!