Three days after ovulation, intercourse is not pregnant, because after the egg is discharged, it can survive in the body for up to 48 hours, or 72 hours if it is three days later, and then intercourse is not pregnant. However, you need to be very sure of the time when the egg is discharged, if you can not determine the time of ovulation, through their own calculations, there is a possibility of inaccuracy. Because when the follicle is discharged, it is inaccurate by calculating or using a pregnancy test, sometimes it may be delayed or advanced, and some people will have an accidental ovulation. Therefore, if you have intercourse three days after ovulation, it is best to use effective contraception to avoid unwanted pregnancy.