Sore breasts are normal and I wouldn't worry about it. The only other thing it could be a sign of would be pregnancy, but the symptoms for pregnancy and your period or stress are all very closely related, so they are not reliable to follow. If you think you may be pregnant, take a home pregnancy test, otherwise you just have sore breasts from the extra hormones before your cycle starts.
yes, i am. but ive also been getting cramps, which always happens a few days before gettin my period
It may just be a hormonal change and your body is reacting to that making your breasts sore. That is completely normal, and many females have sore breasts right before their period. Are you sexually active?