I'm 36w5d, and this little girl isn't moving as much either...or at least I can't feel her moving. When I palpate my stomach, it seems like her back is to the outside, so I think when she kicks it's toward my back, so I don't feel it as much. I feel more down low, when she moves her hands. They're running out of room! But if you're still feeling anxious, I don't think it would be a bad idea to go in and at least listen to a heartbeat to ease your mind.