During the first 24-48 hours of labor, the cervical opening begins to dilate, causing the fetal membranes near the cervical opening to separate from the uterine wall there, resulting in a small amount of vaginal bleeding due to the rupture of capillaries, which is mixed with the mucus in the cervical canal and discharged. Generally speaking, the labor pains will start within 24 hours after the redness and the labor phase will begin. However, there are many pregnant women who go into labor a few days or even a week after the onset of redness. Some pregnant women do not experience the phenomenon of redness, but their water breaks first, and only after the amniotic fluid flows out do they show stomach pains and uterine contractions, which is also normal, and this situation varies from person to person. If you have stomach pains when you reach your due date, it is normal to check the fetal heartbeat and amniotic fluid, as long as you pay attention to the ultrasound and check for changes in the fetal heartbeat and amniotic fluid.