I'm 17/18 weeks pregnant (slight disagreement between my dates and the ultrasonographer), utterly paranoid, and haven't felt as much movement for the last day or two. The little thing was very busy on Wednesday- I was even getting the odd kick along with the squirming. Did I mention I was paranoid?
I can't actually remember if this is normal or not. I seem to think that my third child was like this, but it was about a thousand years ago and I might just be clutching at straws. I know, I'm just paranoid and neurotic.