BREASTS SEEM BIGGER, SORE

my breasts seem bigger and are super sore. i am so paranoid i’m pregnant all the time. i am on the pill and never miss a day but my boyfriend doesn’t wear a condom. he never cums inside of me but i know it can sometimes happen from pre cum. i just am banking on my pill to cover for that i guess. anyway, i have had my period for almost 10 years at this point and have never noticed my breasts enlarging from hormones from a period but can that be a symptom? HELP!!!