i have days when the movement is different too... I suppose its down to baby's position and a little bit less space in there!
As long as you are feeling regualr movements, I've read it doesn't matter if they are rolls, squirms or kicks/nudges...
I noticed from about 28 weeks that baby's movements seemed to change to more like squirms and gentle glides of arms, legs etc moving from side to side, I do still get kicks but not as much, it definitely feels different but still regular movement.
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