Brown discharge at 7 weeks in early pregnancy may be caused by fetal arrest, preeclampsia or ectopic pregnancy. 1. Fetal arrest: when a pregnant woman is in the 7th week of pregnancy, due to chromosomal abnormalities and other factors, part of the fetus stops developing, and brown discharge may also occur. 2. Pre-eclampsia: Pregnant women in the 7th week of pregnancy belong to the early stage of pregnancy, the embryo bed is unstable, easy to pre-eclampsia, so there will be bleeding. When the amount of bleeding is small, it will be oxidized, resulting in brown discharge, usually accompanied by abdominal pain. 3. Ectopic pregnancy: During pregnancy, the embryo will settle outside the uterine cavity, resulting in ectopic pregnancy, and at this time, the endometrium will be shed, so there will be bleeding, and the symptom is brown discharge. If pregnant women in early pregnancy brown discharge, there may also be other causes (such as cervical polyps, etc.), it is recommended to go to the hospital as soon as possible, with the doctor to do the relevant examination, to clarify the cause of the disease, under the guidance of professional doctors for treatment.