Iam 27yrs old the first day of my last period was 18 th feb,2012, i took postinor 2 on 25th Feb,2012 i have started bleeding like my normal periods on 3rd March,2012 and am also feeling weak....am so worried please elp me could it be the effect of the emergncy pill interfering with my menestrual cycle since i was supposed to have my periods towards the end of this month,what should i do.......