This question has been clearly answered and is not complicated. Because sperm will live in the woman’s body for up to a week, conception has a chance of happening each day beginning 7 days prior to ovulation. The important fact is that the “chance” increases each day up to the day of ovulation. Too often, couples will avoid intercourse while waiting for ovulation. This is not beneficial and may even be harming their chances. Men produce new sperm every day and normal sperm counts are maintained at frequencies of intercourse every 2 days. Abstinence for more than 5 days reduces sperm quality. Thus, if a couple does not use ovulation predictor tests, intercourse on alternate days covers the window quite effectively.