Is this normal

Anna • married to the most wonderful husband in the world, a mom to a beautiful angel baby and my handsome rainbow baby boy grason j.Green!!!!💙💙💙 23 years old

So i just turned 19 a couple of weeks ago actually on mothers day... anyway my husband has started noticing that my tatas as he calls them are getting bigger but im loosing weight also my back has been in alot of pain upper and lower... what the heck... my period is supposed to start tomorrow but i dont want it too... what could it be??? Am i just growing into my woman body or is there something else...

Ps sorry for the long post just kinda freaking me out i have gained probably a cup size or more and it's only started since this month

Update: shark week decided to show up a day early for the 2nd month in a row!!! Seems like it starts a day ealier than i usually do...