The day of ovulation is after the strong positive turns weak. The ovulation test paper measures luteinizing hormone, and when the ovulation test paper reaches a strong positive, usually when the luteinizing hormone reaches its peak, the follicle will rupture and be discharged about 36 hours thereafter. So the day of ovulation is after the ovulation test paper strong positive turns weak. Since sperm can survive in a woman’s body for 3 to 5 days, intercourse can be arranged when the ovulation test paper shows a strong positive, and the frequency of intercourse can be appropriately increased during this period, such as every other day, which can improve the chances of pregnancy. Women can also go to the hospital to monitor ovulation through ultrasound, which can be more intuitive to see the changes in the egg, measured ovulation time is also more accurate.