reneenay, I had exactly the same thing as you hun. I had been feeling baby move from about 14 weeks, then at about 17/18 weeks I had felt nothing for nearly a week. I ended up ringing my Ob and he said that generally you don;t feel them till later and almost certainly when you do strat feeling them earlier, they are so little that all they need to do is change positions and their kicks are not strong enough to feel and that you go through a period/s of not feeling them.

If you are still concerned though, definately call your Ob/midwife