Suggest Medication To Prepone A Menstrual Period

i m 25 years old.my height is 5ft2inch. my weight is 55kg.i m getting married on 11july'2011 and my period fall on 09 july. i want to know is there any medicine to have advance period 5 days before my period date, so that my period will fall on 5th of july. please reply soon.