it can be any time before or at the time of ovulation.. our ovum is alive for only 24 to 30 hours but sperms are alive for a minimum of 3 days and a maximum of 7 days.. so any time close to ovulation.. after ovulation has a very short span but yes it too has a chance.. but i would suggest 21st is a very good time.. good luck.. hoping for the best..
Before during and after! Only 12-24 hours after tho. With absolute ideal conditions (lots of fertile cervical mucus) sperm can live 5-7 days in a woman's body. So start BDing (baby dancing) 7 days before you're supposed to O and every 2-3 days till just after you O. After that, it's just for the fun and enjoyment of it!