The brown discharge coming out of the vagina indicates that there is old bleeding in the uterine cavity and vagina. The possible reasons for the brown discharge coming out when you are more than 7 months pregnant mainly include: 1. What should be taken into consideration is that it is possible that the low position of the placenta has caused abnormal bleeding, which cannot flow out in time due to the small amount of bleeding and stays in the uterine cavity for too long and turns into black discharge. 2. In pregnancy The patient may be suffering from uterine fibroids, endometrial polyps and other uterine pathologies at the same time, resulting in a small amount of abnormal bleeding. 3. Decreased resistance to disease during pregnancy, or poor personal hygiene habits, resulting in pathogenic microbial invasion and infection, causing inflammatory gynecological diseases such as vaginitis and cervicitis, thus causing bloody discharge. No matter which is the case, when brown discharge appears, you should pay attention to it and go to the hospital as soon as possible to find out the cause and then treat it.