Crazy kicking then nothing?

Hayley • Luke 7/15/17; Colt 6/14/19; #boymom 💙💙

I’m sitting on the couch and baby was kicking like crazy for several minutes, and then just all of a sudden stopped. I don’t remember my first ever doing anything like that, is that a normal thing for babies to do at this point or should I be concerned? 38+2 today