Is there a way I could postpone my period for prom?

My prom is this thursday, June 23rd. Last month I got my period on the 24th, but for me my period has never been regular, ever. But as of now it feels like it's going to come any day now. I am not on birth control and I haven't been to the gym in a while, like over three weeks. I was wondering if there is anything I can do that hold off my period? I was maybe thinking of working out really hard for the next 3 days, drinking a lot of water, etc. I have birth control in my possession but I don't think it would do anything to start it now. PLEASE give me some suggestions! I really do not want to have it for prom!