In school, please help!?

I couldn't help it. I forgot to go pee this morning before leaving for school, and by the time I remembered, it was too late. In the morning, I always gotta go real bad, but this time at school my homeroom advisor said no one could leave, and in my first cl (calculus) I peed my pants, but it only sounded like a little. I still have to GO...BAD. What should I do????