Baby movement 30 weeks

My baby has been extremely active since around 18 weeks! I almost feel constant movement throughout the day. I’ve noticed most of his moving is during night when I’ve settled down and gotten in bed. It’s usually tons of kicks and moving around until i eventually fall asleep.

But today has been a very weird day for movement. I have felt him every now and then throughout my day very lightly, but nothing like it has been before! I’m laying in bed now and feel nothing? It’s a little strange because I’m so used to intense kicking and movement.

Should i be concerned? Or is baby just getting bigger with less room to move around?