Pre-pregnancy generally does not cause bleeding, but vaginal bleeding can be caused by bleeding during the implantation period, pre-miscarriage and other conditions. Pre-pregnancy refers to the early stage of pregnancy, generally will not bleed, but some women will be in the fertilized egg implantation of a small amount of vaginal bleeding, usually lasts for 3-4 days can be recovered, this is a normal physiological phenomenon. This is a normal physiological phenomenon. However, when the corpus luteum is not functioning properly, due to low progesterone, vaginal bleeding and other symptoms of miscarriage may also occur, which is a pathological condition and requires fertility preservation treatment under the guidance of a doctor. In the early stages of pregnancy, due to the unstable development of the embryo, we must pay attention to proper rest, not to strain and strenuous exercise, prohibit coitus, and continue to follow the doctor’s advice to take folic acid on time. When there is abdominal pain, vaginal bleeding and other conditions, we should go to the hospital for ultrasound, progesterone and blood HCG (human chorionic gonadotropin) test to make a clear diagnosis, and actively preservation of the fetus treatment. In clinical practice, when vaginal bleeding occurs in the early stages of pregnancy, it is necessary to go to the hospital to find out the cause and treat the symptoms.