I had unprotected sex with my Boyfriend on 27august, and I took postinor 2 on 29 August. Today on 3 September, I started bleeding. My period is supposed to come on 17 September, two weeks later. Is this bleeding due to postinor or implantation? Should I wait for my period to come for real? If is it because of postinor, how Long will I bleed for? And if my period is to come early, how early is it? Thank you!