A small amount of brown discharge on the ninth day of IVF transplantation may be caused by implantation bleeding or preeclampsia, other factors and so on. 1. Bleeding at the time of implantation: a small amount of brown discharge on the ninth day of IVF transplantation is likely to be a small amount of bleeding caused by the stimulation of the endometrium after the implantation of the fertilized egg, usually accompanied by a slight abdominal pain and discomfort, need to stay in bed for observation, and most of the time it will disappear on its own. 2. Pre-eclampsia: brown discharge from the vagina on the ninth day of transplantation may also be a pre-eclampsia phenomenon of unstable implantation of the fertilized egg, usually brown discharge lasts for a long time, abdominal pain is obvious, accompanied by lumbar pain and other discomforts. 3. other factors: transplantation of a small amount of brown discharge on the ninth day should also check whether the embryo failed to bed biochemical pregnancy, or women suffering from cervicitis, cervical polyps and other diseases caused by abnormal bleeding. After the transfer of a small amount of brown discharge, need to improve the relevant examination, clear causes of brown discharge after treatment.