Don't worry! Every pregnancy is different. My first pregnancy I felt the baby move around 18 weeks, I'm 20 weeks now and I'm just now feeling those same movements. I think it may be due to the fact that I'm about 15 pounds heavier this time around.
I wouldnt worry. Your baby still has plenty of room to move so you may not feel it right away. Im sure youll be feeling the kicks soon, and as long as your doctor says they are healthy you should be good(:
I felt my second baby way earlier , with my 1st I felt him move around 20 weeks and my second it started at 10 weeks