Answers:
It could be what the other character said, or conceivably you're ovulating.
Stress usually cause your interval to be behind time. Cramps could be a sign of PMS and you could be getting your time of year soon.
what?! cool...powerfully i won't hold my spell for awhile.lol.i send for ur doctor and ask him/her something like it. or if u still live w/ ur parents or guardian put in the picture them roughly speaking it.