Not trying to conceive

Okay. I posted a previous post and I took a negative pregnancy test on the 28 BUT im supposed to get my period today and so far nada! Boobs hurt so bad and I've been getting sharp pains so my guess is it was too soon to test and im pregnant and experiencing stretching pains in my uterus. I've been pregnant before and I really think this is it. I just feel pregnant!! Which would make this yet ANOTHER December baby! My last was born Christmas eve!! Will keep you updated!! My post before was titled cm and pregnant????