I have days where Vince is facing my back, and I don't feel him all day at all, then suddenly I will stop moving and lay down or I will feel him flip around and BAM there it is!
Also remember, if you are like me and been up and about for Christmas, the motion of you moving kind of rocks them to sleep or soothes them, so they say. I know I've been up constantly and I only felt him moving really a lot when I stopped and sat down for awhile or while I was laying in bed. I'd feel him sometimes when I was up, but not nearly as often when I wasn't as busy. I hope this eases your fears, Mama! I know I've been neurotic about it too. Merry Christmas!