Hello, i am very nervous about asking this question because I'm not sure if it's a really valid question. Ok I've been keeping track of my cycle from December '12 and my first day of my last period then was on the 5th, January 4th '13, February 5th '13, March i have still not seen my period, i had intercourse on the 9th and 10th to this day still no sign of my period, what could be wrong?