My baby barely moves...

I am 33 weeks and I'm pregnant with a baby boy I'm a FTM. He was extremely active before, when I go to my doctors appointments he's moving and interacting with the doctor so she says he extremely healthy and really active. Last time I went I was 31w. Now it's like he's barely moving I don't know if I'm overreacting or not ...they say 10 kicks per hour but it seems like I only get 10-15 kicks per day instead of an hour!! I'll drink cold water and lay on my side & he reacts instantly most of the time to that. The most he really does is move side to side and stretches out , sometimes he won't move for awhile but he'll start hiccuping so I take that as a good sign.... but do you guys think it's a growth spurt he's going through or what?