Why Are My Menses Delayed Even After Taking Meprate?

Hi, may I answer your health queries right now ? Please type yoi'v taken melmet-500mg twice daily and meprate-10mg once in night from day-15 to 24.my doctor told after last pill of meprate period will come within 7days but nearly 19days have passed still no periods but for past 2 weeks i find period cramps like nausea,sore breasts,backache,headache.my lmp-feb6th.i'v not done any test.is there any pregnancy chances and my doctor told low dose of meprate is not a contraceptive.i'm more confused.ur query here...