hi im 24 years old..i have a problem in my menstraution.,my last menstraution is june 6,but still now i dont have my period yet,,i try to use pregnancy test 4 times but it is negative and then i consult to an OB gyniecologist,she gave me a duphaston .and now i take it for 5 days and still i dont have yet my period,,pls.help me im so worry, thanks..