Should I be worried? 31 weeks

I'm currently 31 weeks and I have noticed a decrease in my baby's movements. She never moved a lot, but she moved more than she has been, and the movements aren't as strong as before.

I've been working a lot of over time so I have been moving around more and I know that moving around can lull them to sleep, I also read that around this time in pregnancy they may spend more time asleep. I was going to ask my OB at my appointment but we missed it because of my husband taking too long to get ready.

The hospital in my town doesn't have anything to do with pregnancy, when I went to them last year for a miscarriage all they could do was take my blood, so I would have to drive to another town, about 30-40 minutes away to go to the hospital. I really don't want to but if I have to I will.

I was just wondering if anyone else had their baby move less while working more or when they got closer to their due date. Should I go to the hospital or is this normal?