The brown discharge on the 8th day of frozen embryo transfer may be a manifestation of implantation bleeding, or it may be caused by the failure of implantation or preeclampsia. 1. Bleeding on implantation: brown discharge on the 8th day of frozen embryo transfer is likely to be a small amount of endometrial exfoliation caused by stimulation of fertilized egg implantation, thus causing a small amount of bleeding. General bleeding is small, brown or pink discharge, will disappear on its own, bed rest and observation. 2. Failure of implantation: brown discharge on the 8th day of frozen embryo transfer does not exclude the phenomenon of failure of implantation, generally brown discharge or more, accompanied by abdominal pain and discomfort, can be combined with the blood HCG test to clarify, and go to the hospital in a timely manner. 3. Pre-eclampsia: brown discharge on the 8th day of frozen embryo transfer may also be the phenomenon of pre-eclampsia caused by the lack of progesterone after successful conception, which will generally be accompanied by brown discharge, abdominal pain and lumbago and other discomforts. Ultrasound and blood HCG examination can be done to confirm the diagnosis of pregnancy, and then give progesterone, vitamin E and other drugs to protect the fetus treatment. In the clinic, the brown discharge on the 8th day of frozen embryo transfer should not be ignored, and should be treated with bed rest and timely examination of the cause of the brown discharge.