Brown fluid flow in the first month of pregnancy is a small amount of vaginal bleeding, which can occur in the following ways: first, it could be an ectopic pregnancy, because ectopic pregnancy is followed by vaginal bleeding, dripping or abdominal pain. In the second case, it is possible to have a normal pregnancy, but with symptoms of preterm miscarriage. In the third one, although the pregnancy is normal, the embryo is not developing well and the fetus is aborted, so there will be a flow of brown discharge. In which case, we have to check the blood HCG and ultrasound. The ultrasound can see if the pregnancy is intrauterine; if it is intrauterine, whether there is fetal heart and fetal bud development. If the HCG and ultrasound are normal, progesterone should be checked to see if the symptoms of preterm abortion are caused by luteal insufficiency.