In clinical practice, when the ovulation test paper turns from strong positive to weak positive, it can be judged that ovulation has occurred, and the results can be read under the guidance of a doctor. Women who are preparing for pregnancy can increase their chances of conception by having intercourse during the ovulation period, and can monitor the ovulation period through ovulation test strips. Generally in the menstrual cycle of the 10th day began to use, and try to choose in the same time period for testing, when the test paper appeared the same color of the two red lines of the same dark suggests a strong positive, this time to start arranging for coitus, continue to monitor the 1 ~ 2 days of a strong positive to weakly positive can be prompted to have ovulated. However, because of the ovulation test paper to monitor ovulation may appear false positive or error, when 3 consecutive months to monitor the strong positive, or in the ovulation test paper to monitor the coitus did not conceive, need to be guided by the doctor through the ultrasound to monitor the follicle development to determine the period of ovulation, in order to improve the chances of conception.