The various causes of breast soreness are premenstrual syndrome,hormone therapy,pregnancy and breast feeding,fibrocystic disease,use of oral contraceptives and rarely a breast malignancy. Please consult a gynecologist and discuss these possibilities.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.