1. Regular menstruation. The average menstrual cycle is 28 days, 7 days before or after the wrong day can be considered the normal range, the period is 3-7 days, the volume is medium (10-20 sanitary napkins can be). There is more clear leucorrhea in the vagina around the 14th day of menstruation, and the straining can reach 8-12cm, followed by an increase in basal body temperature of 0.3-0.6 degrees in the morning, which lasts for about 14 days that decreases, and the onset of menstruation. 2, normal sex life: no more than 3 times a week is appropriate, too frequent leads to a decline in sperm quality. In order to increase the chance of conception, you can choose when vaginal discharge increases, once every other day until the discharge decreases or the basal body temperature rises for 4 days. 3. Normal semen: volume about 2-6ml, PH value 7.5-7.8, liquefaction within 20 minutes, sperm count 60 million/ml, activity rate above 60%, abnormal sperm count below 20%.