My last period was between 23-27 Nov.i had sex on 18 dec nd took one pill within 5 hrs.again I had sex on 24 dec.and took another pill .and after that I was taking green tea 2,3 cups per day for getting periods.nd on 30 dec I got my period but its dark brown in color nd continuing from last 3 days.is der any chance of prgnency?