10 weeks pregnant with brown blood flow may be a pre-eclampsia, ectopic pregnancy, embryonic arrest, cervical disease and other causes. 1. Miscarriage: 10 weeks pregnant in early pregnancy fetal sac instability, the uterus is subjected to large vibrations such as bumps, sexual intercourse, etc. may appear vaginal flow of brown blood, and accompanied by paroxysmal abdominal pain, belong to the first sign of miscarriage. 2. Ectopic pregnancy: 10 weeks of pregnancy, vaginal bleeding brown blood brown blood, accompanied by lower abdominal pain may also be related to ectopic pregnancy, in addition to the blood HCG can be elevated but not multiply, no gestational sac in the uterine cavity, and the presence of mass in the adnexa. 3. Embryonic Fertilization: Pregnant women have no symptoms, but the symptoms of vaginal flow of brown blood, once diagnosed need to be emptied immediately. 4. Cervical diseases: such as cervical polyps, cervicitis, cervical cancer, etc. can cause the symptoms of 10 weeks pregnant with vaginal bleeding brown blood, need to carry out gynecological examination preliminary identification. 10 weeks pregnant with brown blood recommended to go to the hospital in a timely manner, improve the abdominal ultrasound, blood HCG and other tests to identify the cause of bleeding and then actively treat, so as not to delay the condition.