Im 33 weeks and this happened to me. Your susposed to be able to feel the baby move 6-10 times an hour and if you feel less you are susposed to go to the hospital and get checked out. I had to do this last night. They monitor the babys heart beat and from there decided what to do.
They say girl are more lazy. But the further along you get, less movement. My dr told me if i feel like my baby isn't moving just to lay on my left side and put my hand on my belly and it'll help.
I'm on my feet all day so i don't feel her but a few times a day but when i get home and lay down or not moving as much as i am at work she moves all the time even at night when I'm sleep but if you feel like it's something serious then tell your doctor or go to the e.r if worried