Im not on the pill but I do use condoms. The last time I had sex was in the very beginning of February and then I got my period in the end but it was dark brown for a week. Prior to that I got my period twice in January. Now its the end of march and I havent gotten my period. Im a week late and I dont know what to do. Im an athlete (a runner) and I also workout at home I started off doing half an hr workouts and now this past week its been 1 hr long workouts. So I dont know if thats what caused the delay? Im really scared because I havent missed a period execpt for my first year that I got it but now im sexually active this year. Help! Whats going on with me?