If you have a yolk sac but keep bleeding, it may be caused by low progesterone index, poor embryo quality, etc. You should go to the regular hospital as soon as possible for blood tests, ultrasound, color ultrasound, etc., and carry out treatment to stop bleeding under the guidance of the doctor, and consider fertility preservation treatment if necessary. If there is a yolk sac in the examination, but the vagina keeps bleeding, this is an abnormal situation, which may be caused by low progesterone index, bad quality of embryo, etc. It is recommended to improve the relevant examination as soon as possible, such as blood test, B ultrasound or color ultrasound, etc., to make clear the development of embryo, and you can take progesterone or injection of progesterone for fertility preservation treatment under the guidance of professional doctors. If the examination finds that the embryo has stopped developing, it is necessary to combine with the advice of the obstetrician and gynecologist to choose the procedure of purging the uterus. For the case of having a yolk sac but keep bleeding, it is necessary to go to the hospital in time, choose the fertility preservation treatment or uterus removal treatment according to the examination situation, and go to the hospital for rechecking regularly.