20 days after the transplantation of brown secretion, may be a preeclampsia, ectopic pregnancy, embryonic arrest and other factors caused by the performance. 1. Pre-eclampsia: 20 days after transplantation, pregnant women are affected by a variety of pathogenic factors caused by pre-eclampsia, the gestational sac and the uterine wall is not very close to the connection, the local may appear a small amount of bleeding, it may flow brown secretion. 2. Ectopic pregnancy: If the gestational sac grows and develops outside the uterine cavity after 20 days of transplantation, the endometrium may shed a small amount of bleeding, which is manifested by the discharge of brown secretion. 3. Embryonic arrest: after the transfer, if the embryo stops growing and developing, the embryo and its appendages may be discharged from the uterine cavity, which may be accompanied by vaginal bleeding, and this may cause brown discharge on the 20th day of the transfer. If you have brown discharge for 20 days after the transfer, you need to go to the Obstetrics and Gynecology Department of the local regular hospital for diagnosis and treatment of your condition to avoid serious consequences.