Period And Prom

OK Prom Is In 7 days and I Just Recently got a dress. Well here is the thing. With The Dress That I Got You Cant Were any Undergarmets Because the fabrick its like a silk. But I'm Suppose to start my period the week of and during prom. Is there Any way that I can Hurry My Period or delay it untill like the following week. This its really stressing me out. HELP ME PLEASE it's The 15th of april Now and I need to know soon. I know that if i start prom I'm not gona be able to wear my dress, and if I do I'll Be self Concious all night and I'll Feel Ugly My Senior Prom. Please Please Help Me