If you have a small amount of brown vaginal discharge during pregnancy, you will need an ultrasound to determine if the pregnancy is intrauterine or ectopic in the early stages of pregnancy to make a differential diagnosis. In case of ectopic pregnancy, abdominal pain and vaginal bleeding will occur. Vaginal bleeding may be absent or the amount may be small or large, and most of them will be mistaken for menstruation and ignore the pregnancy. Ectopic pregnancy is an emergency and must be treated in a hospital. If it is a mid-term pregnancy or early intrauterine pregnancy with brown vaginal discharge, consider signs of preterm abortion. If there is still a fetal heartbeat and fetal bud on the ultrasound, it is considered a pre-eclampsia miscarriage, which may be related to the poor quality of the embryo itself and may develop into a spontaneous miscarriage afterwards. If the quality of the embryo is good, you should also pay attention to the fact that it belongs to pre-eclampsia miscarriage and will not develop into spontaneous or inevitable miscarriage, this is not related.