They change! My baby wouldn't move for days, even after I went the labor and delivery panicking because there was no fetal movement, then a week later she was twisting, turning, kicking and punching all day!
I wouldn't worry about too much movement, but lack of movement I would.
Watch out for signs of labor/pre term labor because a lot of times baby gets really active before labor. You're probably fine, just throwing that out there in case so you know :)
It will be more some days than others im 38 weeks and sometimes he is still flipping around in there lol