I really need help

At 1 AM on October 12 I had unprotected sex. my boyfriend came out of me. According to eve it was my fertile window but it said i ovulated on the 14. within 8 hours of having unprotected sex I took take action. Now nine days before my scheduled period on eve I have very light pinkish blood coming out of my vagina is this implantation bleeding or is it a little bleeding before my actual period as I know that taking emergency contraception can make your period a week early or late.