Reduced Movements?

Has anyone else started to notice reduced movements? I’m 38 weeks and I used to feel baby move all the time. Lately (the last few days) the only time I feel him move is if I drink coffee or juice and lay on my side for about an hour. He’ll sometimes make his kick counts when I do that, but just barely (and sometimes I’ll only count 4-5 movements). I have had an NST every week since 36 weeks and everything has been fine but it’s stressing me out. Normally I’d just go to the hospital to be safe but it’s an hour drive away. Any advice?