The purpose of ovulation monitoring is to understand the growth process of follicles, predict the time of ovulation, help find the cause of infertility, control the best time to conceive, and provide a basis for further treatment. Most patients start ultrasound monitoring from the 9th to 10th day of menstruation, individual patients may have different menstrual cycles; 2. The peak level of luteinizing hormone can be detected to predict the best time for conception or contraception), and if necessary, blood sampling for reproductive hormones (P, E2 and LH) to accurately determine follicle development, ovulation and luteal function.