It is not always possible to save the fetus if you see red at 40 days. There are many causes of vaginal bleeding in early pregnancy, such as miscarriage, cervical polyps, ectopic pregnancy, etc. It is necessary to judge whether the fetus can be preserved according to the cause of vaginal bleeding. 1. Miscarriage: according to the presence or absence of pregnancy discharge, whether the mouth of the uterus is closed or not can be categorized into premonitory miscarriage, inevitable miscarriage, incomplete miscarriage, complete miscarriage, etc., and only the premonitory miscarriage has a chance of preservation. 2. Cervical polyp: the cervical redundancy may cause vaginal bleeding, the gynecological examination can see the blood in the vagina from the cervical redundancy, surgical removal and progesterone fertility preservation treatment, if the vaginal bleeding is reduced, no other symptoms appear, most of them can be preserved. 3. Ectopic pregnancy: refers to the fertilization of the egg in the uterine cavity outside the bed, often manifested as menopause, abdominal pain, vaginal bleeding, because the embryo can not survive, but also lead to acute abdomen endangering the patient’s life, so can not be preserved treatment. Clinical patients who experience vaginal bleeding in early pregnancy need to consult a doctor in time to clarify the cause of the disease and follow the doctor’s instructions for treatment.