If the patient’s ovulation is normal and the menstrual cycle is regular, 14 days before the woman’s menstruation is the day of ovulation, and the patient on the day of ovulation has the highest chance of ovulation, so the chance of conception is also the highest. Taking the day of ovulation as a criterion, 5 days before and 4 days after is the ovulation period of women, in the ovulation period of coitus patient’s chances of pregnancy are relatively high. However, due to the influence of many factors, such as women’s mood changes, seasonal changes, etc., women’s ovulation can be disrupted, which can occur both in the ovulation period, can also occur in the safe period. Therefore, if a woman wants to maximize her chances of conceiving, patients are advised to use ultrasound to monitor ovulation and guide intercourse. When the ultrasound suggests that the follicle has developed to 1.8cm, it is a mature follicle, and you can choose to cohabit, cohabit every other day, 2-3 times in a row, usually will not miss the time of ovulation.