Baby not kicking enough??

Hannah

I am currently 21w 3d and I feel as though my baby isnt kicking enough? I had 3 strong kicks 2 days ago, but havent felt anything since. I'm also a first time mom no I truly have no real idea as to what or how much I should be feeling. I also have my checkup in 2 days to talk to my doctor about it, just thought i'd get y'alls input. Thanks in advance!