Why my period hates me!

Mkay, so I'm a 13 year old dancer and starting Monday I am taking a Masters class from this really famous dude from Germany. I was supposed to start my period the Wednesday after next so I would be fine for the class. But guess what!! Mother Nature decided that it needed to come early for some unknown reason. Yay me! So now I get to spend what was supposed to be a fun class wallowing in pain because my uterus is killing itself :)