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okay so im 15. ive been with the same person for 2 years. i was on birth control but the pharmacy didnt fill my prescrption. we have always used the pull-out method. we have never really used condoms. and recently my low back and stomach have been hurting like cramping. and my nipples have been really sore. a sign is soreness and darkening its just sore. i havent really been feeling sick but i have been getting headaches. and hurts when i have s_x when he goes to far. when before it didnt bother me. am i for sure pregnant?