The appearance of brown discharge accompanied by vague abdominal pain at 11 weeks of pregnancy is considered to be a possible preeclampsia, and there are more causes of miscarriage, such as embryonic factors, anomalies in the maternal genitalia, maternal luteal insufficiency, and sexual stimulation. Pre-eclampsia is often characterized by a small amount of vaginal bleeding, accompanied by mild lower abdominal pain, and closure of the uterine opening. If the fetus survives and the symptoms disappear after active treatment, the pregnancy can be continued; if the symptoms worsen, miscarriage may occur. 1. Embryonic factors: abnormalities of embryonic chromosomes are the most common, including numerical and structural abnormalities. 2. Abnormalities of maternal genitalia: such as longitudinal uterus, uterine submucosal fibroids, etc. can increase the chance of miscarriage, which can be treated by hysteroscopic surgery before pregnancy. 3. Maternal luteal insufficiency: this can lead to insufficient progesterone secretion, which can’t maintain the pregnancy, thus resulting in miscarriage. 4. Sexual stimulation: it may induce contractions, which may lead to miscarriage. If symptoms of miscarriage occur, you need to consult a doctor in time to assess the condition of the fetus and follow the doctor’s instructions to deal with the treatment.