The process of ovulation is clinically difficult to detect. When a woman’s follicle develops and matures, the egg will be discharged after the follicle appears to rupture, so the process of ovulation is very short, just a split second’s time, and the egg can be discharged. However, before the egg is expelled, the preparation time for ovulation is relatively long, usually requiring two days of preparation. In the 24-48 hours before ovulation, estrogen levels must reach 200 pg/ml, while luteinizing hormone, too, must peak within 36 hours before ovulation occurs in a woman. The optimal time for conception after ovulation is very short, and if you want to improve your chances of conception, you need to have intercourse after the follicle has matured and before ovulation, because sperm can survive for 72 hours, and you will be able to conceive in time for ovulation. All patients can do ultrasound, when the follicle development to 1.8cm can choose to cohabit, at the same time every other day cohabit, consecutive cohabit 2-3 times will not miss the ovulation time.