Suggest Medications For Irregular Periods

hi doc,ive been dignosed for PCOS since i was 17 and now im 25, married for 3months. doc already prescribed duphaston and metphormine so that i can get my period. i wanna stop duphaston cuz i gain too much weight after consuming it for many years.. and metphomine juz make it worst. what r other medcine option for me to get back my period and get prgnant. pls help me