4BB blastocysts are good quality blastocysts with a grade of Grade 1 ready for normal transfer, meaning blastocysts that have been raised to 4 days. Before IVF, the blastocysts are raised and selected to be transferred into the uterine cavity. The success rate of IVF is not only related to the blastocysts, but also related to the endometrial environment that is suitable for the fertilized egg to grow and develop, as well as the woman’s general nutritional status and physical fitness. Only when all three aspects of the relationship are good can a healthy embryo develop. After the successful IVF transfer to the uterine cavity must pay attention to appropriate rest, increase nutrition, and avoid the stimulation of adverse factors. Blood tests for chorionic gonadotropin levels can be taken about 10 days after the IVF transfer, and its elevation will be highly suspicious of early pregnancy, and regular rechecks in the future will be sufficient.