I am experiencing really bad breast pain and it has been a week now. I am not suppose to start till the 20th of this month. I am not on birth control and we did not use a condom but he did not go in me. Are there other reasons my breast could be hurting? I am 23 and have no other signs yet that I could be pregnant. I am freaking out inside and wish I could find out now whats going on. Any knowledge would help!