Sudden brown discharge at 11 weeks of pregnancy may be caused by preeclampsia, ectopic pregnancy or placenta praevia. 1. Pre-eclampsia: 11 weeks pregnant women appear vaginal brown discharge, may be the manifestation of pre-eclampsia, this time the pregnant woman should be bed rest, active birth control, to prevent pre-eclampsia to develop into difficult to avoid miscarriage. 2. ectopic pregnancy rupture: 11 weeks pregnant suddenly have brown discharge, there may be ectopic pregnancy, if the ectopic pregnancy rupture leads to more internal bleeding, bleeding into the abdominal cavity, in addition to the vagina has brown discharge, women may also appear dizziness, pallor and other hemorrhagic shock manifestations. 3. Placenta praevia: The brown vaginal discharge of a woman in her 11th week of pregnancy may also be caused by placenta praevia. If the placenta is positioned too low, there may be vaginal bleeding in early pregnancy. If the bleeding is small, the bleeding is not discharged in time, and is oxidized in the vagina, then brown discharge will appear. Women who are 11 weeks pregnant with brown vaginal discharge may also have other causes, and it is recommended to go to the hospital in time to clarify the cause, and then carry out targeted treatment and management.