Bleeding in the 12th week of pregnancy may be caused by preeclampsia, fetal abruption, gynecological diseases, etc., and is treated by fertility preservation therapy, uterine evacuation, and targeted medication. 1. Fertility preservation treatment: Bleeding during 12 weeks of pregnancy may be caused by placental hypoplasia, low progesterone and other causes of preeclampsia, through ultrasound examination of the fetus intrauterine development of good fertility preservation treatments, such as bed rest, supplementation of progesterone. 2. Uterine evacuation: Bleeding in the 12th week of pregnancy may also be fetal arrest, such as embryonic dysplasia, chromosomal abnormalities caused by the embryo can not be aborted naturally, the need for timely treatment through the removal of the uterus. 3. medication: bleeding in 12 weeks of pregnancy may be gynecological diseases, such as cervicitis, vaginitis, inflammation stimulation of mucosal congestion and edema after bleeding, such as mycosis vaginalis with bittersweet gel, clindamycin gel and other treatments. 12 weeks pregnant if there is a slight bleeding, through appropriate rest can not be relieved, showing a persistent aggravation of the trend, and accompanied by abdominal pain manifestation, should be early medical consultation, clear diagnosis of the causative factors, under the guidance of the doctor symptomatic treatment and conditioning.