After how many days conception occure after sex and how many days implantation bleeding starts from conception and how long mplant bleed lasts?

Conception. Fertilization normally occurs 12 to 24 hours after ovulation. Implantation of the embryo into the uterine lining occurs approximately 7 to 9 days after fertilization. Very occasionally there may be a small amount of bleeding with implantation but this normally does not occur.