Baby movements welcome but uncomfotable

Terree • Expecting My First Baby (Its a Girl!) Due 9.14.16 ❤😍
My daughter moves ALOT when im laying down and it doesnt hurt most of the time, it just feels weird, im 31&2 today, its it just because im so tiny (I look like im 4 months pregnant) and she is getting bigger? Also it feels like she is right on the bottom of my tummy, what could that mean?