Any abnormal vaginal bleeding that occurs during pregnancy is not normal. At 11 weeks of pregnancy, if bleeding occurs, it is definitely dangerous. First of all, if the bleeding is not heavy and accompanied by slight stomach pain, it is usually considered to be a preeclampsia. This situation is related to the unstable development of the embryo, poor rest of the pregnant woman, or the influence of external factors. Secondly, if the bleeding is particularly heavy in the 11th week of pregnancy, you need to consider that there may be placenta previa, or inevitable miscarriage. Bleeding especially heavy may cause the patient to suffer from hemorrhage, or shock. Therefore, regardless of the cause of the bleeding, and regardless of the amount of bleeding is large or small, you need to go to the hospital in time to check, if necessary, need to be hospitalized to keep the fetus, or hospitalized for surgical treatment.