The difference between implantation and non-implantation after an IVF transfer is mainly determined by the level of chorionic gonadotropin values in the blood. IVF is an assisted reproduction technique in which sperm and eggs are grown into embryos outside of the body and then implanted into the woman’s uterus for implantation and development. The success of an IVF transfer is caused by a variety of factors, such as embryo quality, endocrine function, and endometrial thickness. If the IVF is successful, the HCG value usually starts to rise after 8 days of the implantation, and if the HCG doubles on the next day, it means that the embryo is well developed, and ultrasound can be performed to observe the condition of the gestational sac in the uterus at about three weeks of the implantation. If there is no gestational sac in the uterus and the HCG value decreases, it is considered that the transplantation has failed to form a subclinical miscarriage. In vitro fertilization and non-fertilization after transplantation, you need to go to the hospital for examination and clear diagnosis.