sensitive nipples ? sore?

Okay.. So im a 19 yr old girl. Ive been getting my period since I was 14. today is the 12th and if im not pregnant (just tested said no on two of them!) I should get my period anywhere from now to the 15th. My boobs get thick and more firm but tender and sore just right b4 my period. Never sore nipples.. I cant remember a time that my nipples felt so sensitive like they do now ? Im very confused. I read online sore nipples can mean pregnancy period and wrong size bra BUT My test said negative.. My nipples have NEVER felt this way before and I just bought some new firm fitting to my size bras! Ive bren wearing them.about two months.. So I know it cant b that?

HAS THIS HAPPENED TO ANY OF YOU? could the test have said negative and I could still b pregnant why do my nipples HURT;(