Symptoms that may indicate impending labor may appear before the 36th week of pregnancy, including a sense of descending fetus, irregular contractions, and small amount of vaginal bleeding. 1. Fetal descent: As the prenatal part of the fetus descends into the pelvis, the floor of the uterus is lowered, resulting in a sense of descent of the fetus, and may cause frequent urination due to pressure on the bladder. 2. Irregular contractions: the frequency of contractions is inconsistent and short-lived; the intensity of contractions does not increase; they are not accompanied by shortening of the cervical canal and dilation of the uterine opening. 3. Small amount of vaginal bleeding: within 24-48 hours before labor starts, capillary rupture and small amount of bleeding is called redness. Clinically, when there is a gradual increase in the regularity of contractions, accompanied by the progressive disappearance of the cervical canal, dilatation of the cervical canal and the descent of the baby’s first dew suggests that labor is imminent, if there are relevant symptoms, it is recommended to actively seek medical attention.