Decreased movement

I’m 29 weeks and I’ve started to notice that I can’t feel him move as much. My midwife tells me not to worry but I’m so paranoid that something is wrong. I only feel him move a few times a day at this point.. it all started once I went back to work(I only work Friday’s and Saturdays but I’m nervous that it’s stressing the baby out too much) has anyone else experienced this?