Your fertile days are the days leading up to ovulation, the day of, and the day after. You start to become fertile about 5 days prior to ovulation, are very fertile the 3 days prior, and at your peak fertility the day before and the day of ovulation. You are also fertile the day after ovulation, as your egg can live for up to 24 hours. These days are crucial for intercourse when TTC. Most pregnancies are the result of intercourse that had taken place within the 3 days prior to ovulation. Sex prior to ovulation can result in pregnancy. Sperm can live in your body for 3-5 days, and sometimes up to 7 days. The average is 3. You egg only lives for 12-24 hours max, but sometimes as short as 6. So it is very important to have sex on your fertile days, as well as the day of ovulation. Good luck to you, and lots of baby dust!