Hi, I had unprotected sex with my boyfriend on the 27th Aug. 2016 and took the both Postinor 2 pills at the same time 2 days after (that is the 29th). My began bleeding/menstruating 10/11 days later (that is Sept. 9th) and this lasted 4 days, 2/3 days less than my usual flow. My period came back on the 21st Sept. as the usual time my period would come and lasted the full 6/7 days. However, it came again yesterday (that is Oct 3rd), please advise on whether this is the pill or if something is wrong with me?