Little concerned

So I'm 29 weeks and my son doesn't move as hard or often as he used to. I used to get kicks among the other little things, but now I mostly just little pushes and nudges few and far between. I try not to freak out because he's still visibly shifting positions, but I was wondering if anyone else has had this happen to them too. Maybe he's just facing my back most of the time and I can't really feel the hard ones? Any advice is appreciated