Hi , my last period was on 4th November 2014, I took an I pill (emergency contraceptive) on 8th November 2014 (5th /last day of my period). I have still not got my periods. I took a test on 1st dec , 5th dec and 10th dec , all my tests came negative .Also I had protected sex on 9th dec 2014 , and I took an I pill in the morning (10th dec , 8:30 am ). also i want to know taking two Contraceptive pill, does it affect my cycle (if yes , how much minimum delay is expected ).Is there any chance of pregnancy , why is my period delayed, i was suppose to get it on 1st december .when can I expect my period . I have heard norethisterone tablet like( prevent – n) helps to induce period . can I take it to force period . If yes, please guide me the dose and for how many days can I take it .