I usually get my periods within 27-28 days. Last month I got it on the 13th of November and this month I got it quite early on the 7th of Dec (so 25 days). I had unprotected sex with my boyfriend on the 10th, 11th and 12th morning of Dec (ie day 4 and 5 of my period and one day after). I took an emergency pill early 13th morning (within 72 hrs- 68th hr to be exact). A 6 days of taking the pill, I am experienced vaginal bleeding for a day. What is the chance of pregnancy in this scenario?