If there are signs of miscarriage at 12 weeks of pregnancy with placenta low in the cervix, timely treatment is needed. If there are no symptoms, no special treatment is needed, and attention should be paid to adjustments in life. 1. Signs of miscarriage: 12 weeks pregnant with placenta previa cervicalis, if there are symptoms of irregular vaginal bleeding, you need to be under the guidance of the doctor for fertility preservation treatment. If ultrasound and blood HCG tests make it clear that there is no longer any significance of preservation, timely abortion surgery is needed to avoid the possibility of hemorrhage. 2. No need to deal with: if there is no symptom, you need to regularly review the placenta, close monitoring, prohibit sex, prohibit excessive exertion, try to rest in bed, pay attention to a light diet, balanced and rich in nutrients. 12 weeks pregnant placenta low cervical opening, must be based on the specific situation by the doctor, to develop individualized diagnosis and treatment plan, so as not to affect the health of the mother and child.