Generally speaking, labor can be initiated 24 to 48 hours after the sighting of red in the second trimester, and the exact time of delivery will be determined by the progress of labor. Seeing red is a small amount of vaginal bleeding accompanied by cervical mucus in late pregnancy, which is a reliable sign before labor starts, and may be accompanied by irregular contractions and a feeling of the fetus descending. Labor usually starts around 24 to 48 hours after the reddish color, but the exact time of labor is further determined by the progress of labor. Regular contractions are an important sign of labor, manifesting as regular and gradually intensifying contractions, spaced 5-6 minutes apart and lasting more than 30 seconds, accompanied by progressive recession of the cervical canal, dilation of the uterine opening and the descent of the baby’s first dew, which has entered the labor process and needs to be prepared for delivery. After 2 fetuses see red, you need to go to the hospital in time, and be evaluated by a professional doctor and given appropriate treatment.