Under normal circumstances, there will be no brown discharge during pregnancy, if there is brown discharge in the 4th month of pregnancy, it may be due to pre-eclampsia miscarriage, low placenta and other reasons, you need to consult a doctor in time, and carry out the corresponding examination and treatment under the guidance of a doctor: 1, pre-eclampsia miscarriage: brown discharge in the 4th month of pregnancy, while the pregnant woman has abdominal pain, abdominal cramps, etc., may be due to pre-eclampsia miscarriage, you need to consult a doctor in time for birth control Treatment, it is recommended to rest in bed, closely observe the brown discharge, most pregnant women can keep the fetus successfully, the brown discharge will gradually disappear; 2, low placenta: if there is brown discharge in the fourth month of pregnancy, it may be due to the position of the placenta is close to the cervical opening, that is, due to low placenta, should promptly consult a doctor for ultrasound examination, under the guidance of the doctor for treatment, and at the same time avoid strenuous exercise during pregnancy, especially not to carry out strenuous The first thing you need to do is to wait until after 28 weeks to review the placenta to see if it is still low; 3, gynecological diseases: if the pregnant woman suffers from cervical polyps, cervical inflammation and other gynecological diseases, there may be brown discharge in the fourth month of pregnancy, if it is not serious, there is no need for drug treatment, to avoid infection, pay attention to observation. If the inflammation and polyps are more serious, anti-inflammatory and hemostatic treatment can be carried out under the guidance of a doctor. Note that you should not take medication without permission during pregnancy, and consult a professional doctor before using medication.