I reallly have to pee!?!?

I really really really have to pee. Like seriously, it hurts. But if I go to the washroom my mom will get mad at me for coming out of my room because it's late and she told me not to come out of my room at all tonight. I don't know what to do. My belly hurts to bad because I have to go so bad :( I was holding it in all night!!! I can't anymore!! What am I supposed to do?