Decreased movement

I'm 31 weeks and noticed my baby hasn't been as active lately. I do kick counts and he's made them until this morning. It was 8 times in 45 mins but nothing after that. I checked him on the doppler and his heart rate was normal at 145. Should I be worried? I tried calling my Dr for reassurance but didn't get an answer. I live an hour away from the nearest hospital and with slick roads I'm just wondering if the benefits outweigh the risks. Not sure what I should do?