Decreased movements? almost 38 weeks.

So for the past two days I've noticed that my son has lowered himself further but I have also noticed he isn't moving as much. He is normally nonstop moving at night towards 1am and lately he hasn't been. I do feel him move around throughout the day just not as much as he used too. Is this because he has possibly engaged all the way? Ive been bouncing on a birthing ball for the past two days for 15 minutes a day and I think it helped lower him down. Is this normal towards the end to feel less movement?