How To Delay Periods?

hi i jst wantd 2 kno which medicine shud i take coz i thnk m goin 2 gt my periods by d day end... n i hav 2 go out d day aftr 2 morow fr abt 7 days... i wnt 2 forward my periods... bt i wndr which medicine shud i tk coz i hav a feeling ll gt my periods by 2day end........