I was suppose to start my period Saturday, and it is now Monday. I usually am a day late and cramp very bad. I have been very nauseous for the past two days and still have cramps, but no period. I also have a white discharge, but I always have that before a period. The stomach bug has been going around, I was wondering if the stomach bug could alter my period? I am also very stressed lately because I am a freshman in college.. Can stress cause a missed period also?