If pregnancy is confirmed and vaginal bleeding occurs, this is not menstruation and may be an abnormality such as pre-eclampsia, miscarriage or ectopic pregnancy. If an intrauterine pregnancy has been previously determined and vaginal bleeding is now present, it may be a preterm miscarriage or miscarriage, and you need to go to the hospital for prompt examination and, if necessary, fetal preservation treatment. If no ultrasound has been done before and vaginal bleeding is confirmed to be intrauterine pregnancy, it is also necessary to check if the pregnancy is ectopic. If it is ectopic, conservative treatment such as mifepristone and other drugs to kill the embryo can be taken first, and if conservative treatment fails, surgical treatment is needed. If vaginal bleeding occurs in the middle and late stages of pregnancy, it may be a miscarriage or premature birth, and you need to go to the hospital for timely examination and, if necessary, fetal preservation treatment. During the period of fetus preservation, you should pay attention to rest and not to exercise strenuously. After pregnancy, you usually will not have your period again, but when you find vaginal bleeding, you need to go to the hospital for examination.