I been cramping for the p three days, when in the hell is the blood going to come out.?

I been cramping for the p three days, and yet to start bleeding. This is making my cycle last longer, which is irritating the hell out of me, since i'm planning on going to banquet next friday. And i would like to be done with my period before then. Is there anyway, any shape on form, that i can make myself starting bleeding. Like exercise, etc