In the eleventh week of pregnancy, if vaginal bleeding occurs, it is often related to the following factors: first, overexertion, which causes symptoms of pre-eclampsia, so that the uterine wall is detached from the gestational sac, so there is bleeding, which is often accompanied by clinical pain in the lower abdomen. Secondly, the embryo has stopped developing, which often results in vaginal bleeding and can be diagnosed with ultrasound. Thirdly, vaginal bleeding is often caused by inflammation of the vagina, which can lead to bleeding, because of the local inflammation of the vagina, the mucous membrane can appear bleeding spots, which can lead to the rupture of capillaries, so it can also lead to bleeding. Fourthly, if bleeding occurs in the eleventh week of pregnancy, it has a great relationship with sexual life. If there is a history of sexual intercourse or a history of trauma in the clinic, it can also cause vaginal bleeding due to symptoms of preterm abortion.