Occasional brown discharge from a woman in early pregnancy is considered to be caused by the following reasons: First, it may be caused by bleeding from the fertilized egg in the bed, and the brown discharge appears particularly early, usually 30 days before menopause. Secondly, it is considered to be due to luteal insufficiency or poor quality of the embryo itself, thus causing pre-eclampsia, which may be accompanied by back pain and abdominal pain while brown discharge appears. Third, it is considered that the fertilized egg did not grow in the uterine cavity but developed in the fallopian tube, which will cause brown discharge and also lead to pain on the side of the lower abdomen. Fourth, it is considered to be caused by embryonic arrest, which is followed by brown discharge and gradually increasing bleeding, accompanied by continuous pain in the abdomen. Fifth, it is considered to be bleeding caused by cervical polyps, which is not directly related to pregnancy.