At 9 weeks of IVF pregnancy, it is still at the level of early pregnancy and is susceptible to external stimuli, so it is an unstable state. The placenta is formed around 9 to 10 weeks of pregnancy in most cases when IVF is performed, so there will be a luteal-placental transition at 9 weeks of pregnancy, which is prone to miscarriage. it is basically stable after 10 weeks, and the placenta may be formed slightly later in individual cases, around 11 weeks. Therefore, it is recommended that fertility preservation in IVF be done at least up to 10 weeks, and if necessary up to 12 weeks. In the clinic, if the fetus appears abnormal at 9 weeks after IVF or if the pregnant woman has symptoms of physical discomfort, it is recommended to go to the hospital in time and take standardized methods of treatment under the guidance of the doctor.