For women who use IVF as a method of pregnancy, estrogen is generally required for 5 to 15 days before embryo transfer, but the exact time cannot be determined due to individual differences and the effects of the medication. For women, estrogen supplementation before embryo transfer can promote the growth of the uterine lining in order to increase the thickness of the lining, in preparation for the fertilization of the egg to bed, the time of use is related to individual differences and the response to the drug, generally need to supplement for 5~15 days. If the fertilized egg is successfully transplanted, it is also necessary to follow the doctor’s instructions to supplement progesterone preparations to maintain the pregnancy to carry on the bed, but also can reduce the sensitivity of the uterus, inhibit uterine contractions, reduce the occurrence of miscarriage. For women who get pregnant through IVF, it is recommended to visit the reproduction center of regular hospitals and standardize the treatment under the guidance of doctors.