The causes of bleeding at 13 weeks of pregnancy may be pre-eclampsia, ectopic pregnancy, gravida, cervical problems, etc., which can be diagnosed according to specific signs and examinations and treated according to the causes. 1. Pre-eclampsia: Generally, in pre-eclampsia, because of the decrease of progesterone, some embryonic tissues will slowly detach from the endometrium, and a small amount of vaginal bleeding will appear first, followed by paroxysmal lower abdominal pain or lower back pain, it is recommended to seek medical attention as soon as possible. 2. After rest and fetal preservation treatment, if the bleeding stops and the lower abdominal pain disappears, the pregnancy can be continued if the fetus has no abnormalities, but if the vaginal bleeding increases or the lower abdominal pain intensifies, it is recommended to terminate the pregnancy in time; 2. The patient will have abnormal vaginal bleeding, severe vomiting, palpitations and other symptoms in the early stage of pregnancy. If the pregnancy is diagnosed as gravida, it is recommended to terminate the pregnancy in time; 4, cervical problems: serious inflammation of the cervix can appear erosion, or the original cervical polyp, it is easy to increase estrogen during pregnancy, causing the surface microvascular rupture, patients may have vulvar itching, vaginal discharge odor, etc., it is recommended to check as soon as possible, timely treatment; 5, other: pregnant women during pregnancy, if overworked, work stress, mental If the bleeding is episodic and not accompanied by abdominal pain, it can usually be relieved after rest. It is recommended to keep quiet, ensure enough rest and relaxation, and carry out fetal preservation treatment if necessary.