What Causes A Delayed Period Despite Taking DUB-5?

my period was due on 14th Nov. i waited till 22nd then i went to a gynec she prescribed me DUB-5, two times a day for 5 days and told me that i will have periods after 5days from the day i stop the pill. its 7th day today i havent had periods yet? Can anyone tell me whats wrong? I am not pregnant.