36-37 week movements

I know towards the end movements can kind of change but is it normal for baby to not really kick and stuff as much? My little guy use to be so active and kick like crazy especially when laying in bed and now I hardly get anything. I can still feel a few movements but it's nothing like I use to have. My doctor said to do kick counts but do I need to do them for every hour or just when he is moving? I'm starting to get really worried.