If you are feeling unsure I would def get checked just to be sure , but baby is running out of room as well so that could be a reason
I’ve noticed when I’m under the blanket and warm she moves around a lot more. She was barely moving a whole lot then I was hooked up to monitors and she wouldn’t stop bouncing off the walls 🤦🏻♀️🤦🏻♀️🤦🏻♀️. She just stubborn.
You should get checked out as soon as you can, just in case, since there is a change in his usual pattern.