Inclusion Criteria:  The first or second cycle of embryo transfer Normal uterine cavity PCO diagnosis based on Rotterdam criteria and correction (2018) Age 20 to 40 years  Exclusion Criteria:  Infertility with severe male factor endometriosis immunological disease FSH higher than 10 BMI greater than or equal to 30 Endometrial thickness on the day of transfer is less than 7 mm History of recurrent miscarriage