Redness at 37 weeks of pregnancy, i.e. a small amount of vaginal bleeding, may be an aura of labor. The pregnant woman is advised to go to the hospital in time to check whether the opening of the uterus has opened wide and to closely monitor the progress of labor. It is recommended that the pregnant woman go to the hospital promptly to check whether the opening of the uterus has been opened and to monitor the progress of labor. If the vaginal bleeding gradually increases, it indicates an abnormal condition, possibly placenta praevia or placenta abruptio. 1. Placenta praevia: painless vaginal bleeding in late pregnancy may be the occurrence of placenta praevia, which may cause intrauterine hypoxia in the fetus and requires ultrasound examination and termination of pregnancy by cesarean section. 2. Placenta abruptio: it is a very serious disease, often combined with hypertension during pregnancy, and the main symptoms are Vaginal bleeding accompanied by abdominal pain. It is necessary to monitor the vital signs and coagulation function of the pregnant woman, and also need to do ultrasound examination to clarify whether there is any problem with the placenta, which requires timely termination of pregnancy, correction of shock, and the use of oxytocin and ergometrine to prevent postpartum bleeding.