Hi, so I m not on birth control . I had sex a few times this month. I am never late on my period. But this month I am. Today will be four days. I usually only cramp the day before and the day I get my period. I ve been cramping a little each day, but no period. I feel like I m getting it, then when I check, there s nothing. I m 20 years old. Please telle there is another reason for all this, other than pregnancy.