You are generally most fertile on the days preceeding and the day of ovulation, however there is a window of opportunity from the point of Ovulation (LH Surge) to ovulation itself of up to 36 hours, so BD as soon as possible and you might just catch the egg!
-If you are still getting fertile quality CM around the time you BD, you are still in with a chance. so if you are having milky, creamy or lotion like cm accompanied by a very wet vaginal sensation or eggwhite cervical fluid you may well still be in your fertile period.