I had the same thing he hanger me an ultrasound to make sure everything was okay and listen to the baby heart beat and she was fine.. Just running out of room... But to be safe go get checked out

If you’re concerned def go in for an NST

I would call. It's always better to be safe.

as baby gets bigger he runs out of room so you might not feel him as much. if you are concerned tho i’d call your dr