Back pain during 12th week

[rayraykay]

Hello! I've been noticing a dull pain in my back today. It's not severe, just dull and achy. Kinda like the back pain I had before my period started but not nearly as painful. This week my belly has definitely shown signs of beginning to pop... I am in that stage of looking chubby but not quite pregnant yet. Is the back pain normal? I've also noticed the same kind of dull achy pain in my hip bones and some in my uterus. I'm hoping/thinking its growing pains?