Hi, I had unprotected sex on August 24th, my boyfriend did not break in me but I took postinor on Monday 26th, 3 days after i saw blood like if my period was going to come, it was very slight flow of blood but it lasted 3-4 days usually my period will come on the 13th of each month and it hasn t come till now. How long again till I can expect it to come? Or could it mean I m pregnant?