It could be because there’s lesser space now. That’s why less space to kick. But as long as frequency of fetal movement is about the same then there’s nothing to be worried about unless there’s decrease in fetal movement then you should get it checked out.
I think as long as theres atleast 10 movement should fine. But if youre worried, best to seek gynae. Cs sometimes somedays they will be less active some days they are more active.
Yes this is normal. Kicks turn into rolls and wiggles as the space gets crunched in later stages of pregnancy.
As long as you feel movements, all is well :)