After an IVF transplant, Xenadrine (progesterone vaginal extended-release gel) is usually required to be used continuously for 8 to 12 weeks. Progesterone Vaginal Extended-Release Gel is a natural progesterone, a progestational hormone analog, which is used clinically for progesterone supplementation therapy in assisted reproductive technology. It is usually started on the day of egg retrieval with one pill per day, preferably at the same time each day. After doing a blastocyst transfer, it is usually continued for 8 to 12 weeks. Progesterone vaginal extended-release gel supplementation of progesterone, the efficacy of the relatively good, safe, only once a day to use, and do not need to be injected, the use of more convenient, will not cause significant gastrointestinal discomfort symptoms. And topical medication can also avoid the problem of oral progesterone metabolized by the liver, the drug acts directly on the uterus, the effect of preservation of the fetus will be better.