J.D.
I am 22 weeks pregnant with my 4th, and I didn't really start feeling movement until about 19 weeks. I was like you, because with all of my boys, I felt them MUCH, MUCH earlier. As long as you are feeling something, I wouldn't worry too much. I would assume you have an appointment coming up the the next 2-3 weeks anyway. =)
Good Luck and Congrats!