The first time I realized I was feeling my baby move was when I was having my 20 week ultrasound, and I saw her kick on the screen and I felt a little bump at the same time. I said, "oh, that's what that was!" Like others have said, you've probably felt it, just didn't realize thats what it is. Don't worry though, before you know it he/she will be getting up under your ribs and letting you know he/she is there!

Good luck with everything!