Brown discharge during pregnancy may be caused by bleeding from fertilized egg implantation, preeclampsia, ectopic pregnancy, cervical disease and other reasons. 1. Fertilized egg implantation bleeding: fertilized egg implantation needs to be implanted in the endometrium, the endometrium has a small number of blood vessel rupture triggered by a small amount of vaginal bleeding, blood in the uterus after a period of time of stagnation discharged, will show brown discharge. 2. Pre-eclampsia: After pregnancy, the gestational sac is not stable or the body’s progesterone secretion is insufficient to support the pregnancy may cause pre-eclampsia, which will also be discharged in brown secretion. 3. Ectopic pregnancy: After pregnancy, the gestational sac does not normally settle in the uterine cavity, but in the fallopian tube, abdominal cavity, ovary and other locations, ectopic pregnancy site small amount of bleeding, there will also be brown secretions discharged. 4. Cervical disease: after pregnancy, women suffering from cervicitis, cervical polyps and other gynecological diseases, stimulated by inflammation may cause brown discharge. There are many reasons for brown discharge during pregnancy, and it is recommended that you seek medical attention in a timely manner.