a bit of food for thought I didn't know this myself so maybe it can help someone else as well xxx

Sharon
It’s common knowledge that sex around ovulation will improve your chances of getting pregnant, but having sex 2 days prior to ovulation will improve your chances even more. According to a 2001 study by researcher D.B. Dunson, women who had sex two days prior to ovulation had the greatest chance of conceiving. An even more interesting observation from the study was that women who only had sex on the day of ovulation had just a 5 percent chance of conceiving. In comparison, the women in this study that had intercourse 2 days before ovulation had as much as a 50% chance of conceiving in any given cycle, depending on their age. What was notable from this study was that conception was most likely in the 4 days before ovulation. The day of ovulation was surprisingly the least likely day to conceive