I've been on the Depo birth control shot for about 2ish years now. Always getting the shot within the window I'm given by the doctors. My boyfriend and I used protection almost everytime but have recently just been using the pullout method and he has never finished inside me. It usually happens about once a week. My breasts have now been very sore for the past two weeks. Sore only when pressed on, but the nipples are not sore at all. Could I be pregnant?? Someone please help!