Safety generally refers to developmental stability. The presence of fetal heartbeat and fetal buds after transfer is proof that the embryo has survived, but not that it is fully developed and stable. Generally speaking, pelvic ultrasound is needed at 6-7 weeks after the transfer, and the presence of fetal heartbeat and buds can be seen, which can generally rule out the risk of early embryonic arrest. However, generally within the first 3 months of early pregnancy, the development of the embryo can not be fully judged to be stable, if within this period, there is unreasonable sex life, too tired, emotions and accidental drugs and other factors, may affect the development of the embryo. Therefore, if the fetal heart and buds are found through pelvic ultrasound, then it is necessary to continue to go to the hospital on a regular basis for examination and observation of the child’s development. If there is any abnormality, then it is recommended to consult a doctor in time to treat the cause.