When I exercise while on my period, I get intense cramps?

I know it's normal to get cramps. But on the days leading up to, during and the days after my period, I can't exercise. One time I did two laps of the track in PE and I felt like I'd been stabbed in the effing spleen. I was doubled over in pain and since my teacher was a guy I couldn't explain. We... show more I know it's normal to get cramps. But on the days leading up to, during and the days after my period, I can't exercise. One time I did two laps of the track in PE and I felt like I'd been stabbed in the effing spleen. I was doubled over in pain and since my teacher was a guy I couldn't explain. We aren't allowed to stay off P.E if we're having bad cramps and we aren't allowed to have medication in the office if it's just for periods. So basically I have to avoid any form of exercise. Help? I don't really want to go on birth control or whatever..
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