Sperm survival time can reach up to 5 days, the egg survival time is 2 days, if you have intercourse 1 day before ovulation, the chances of pregnancy are very high, because at this time, the activity of sperm and egg are very good, if there are no other problems, that is, the fallopian tubes are very smooth, the endometrial lining is very good, and if there is no immune infertility, if you have intercourse at this time, the probability of pregnancy is very high! The. If you are not planning to have children, you must avoid having intercourse during or at the time of ovulation and use contraception to avoid pregnancy.