After IVF biochemistry, it is best to do frozen embryo transfer again after three menstrual cycles. Most of the miscarriages after IVF biochemistry or frozen embryo implantation are because the pregnant women suffer from autoimmune diseases, such as antiphospholipid antibody syndrome, systemic lupus erythematosus, eosinophilia, or endometrial intolerance. It is recommended to improve the relevant examination before the next implantation to find out the cause of IVF biochemistry, and take corresponding measures to treat accordingly to avoid biochemistry or miscarriage after implantation. In order to prevent IVF biochemistry or miscarriage, usually before the transplantation of the relevant examination is done, most of them are no problem before the transplantation, if you can not find the reason it is best to two menstrual cycles before the transplantation. You should go to a regular hospital for consultation and treatment, and if you feel unwell, consult a doctor in time and take active treatment so as not to cause any delay in your condition.