Is It Effective & Safe To Take Meprate For Delay In Periods?

I am 28 years .i have pcos,laproscopy 23rd july 2010,after that i had an miscarriage last year (may 2011).after that we are prescribed yasmin contracep ..for 3 cycle..i had taken 2 cycle ,after that i started letoval and duphaston which were already given before my conception for almost 1.5 year.period became irregularagain. no preg occur .after that clomid and hcg injection along with follicular study treatment were done for 2 cycle..but no positive result..tired of everything and stoppted..but period become irregular..doc told to take meprate..10 for 7 days daily 3 each..this is the 2nd time of meprate ..today is the 5 th day after last meprate taen..no period yet..give some advice..doc