Redness is a sign of preterm labor, and the fetus is usually delivered 2-3 days after redness in the first trimester. The time of delivery may vary depending on the individual health of the pregnant woman. Redness in late pregnancy is a sign that labor is about to begin, as the fetal membranes near the opening of the cervix separate from the wall of the uterus and capillaries rupture, resulting in a small amount of bleeding that mixes with the mucus in the cervical canal and is discharged as a pale bloody, bright red or dark brown secretion. After redness occurs, if the pregnant woman is accompanied by regular uterine contractions, i.e., uterine contractions once every 3-5 minutes, lasting more than 30 seconds each time, the time of delivery may be advanced, and at this time, she should go to the obstetrics department of the hospital in time to wait for the labor to be carried out, in order to ensure that the fetus is delivered without any obstruction. If the amount of vaginal bleeding is high, and the amount reaches or exceeds the amount of menstruation, it should be considered as pathological prenatal hemorrhage, and should be examined in time to make a clear diagnosis, and terminate the pregnancy in time if necessary.