If this symptom occurs during pregnancy like menstruation, if it appears on the due date, it is considered to be a sign of birth, if it does not appear on the due date, it is considered to be a sign of miscarriage or premature birth, if it appears in the first trimester, it should be a sign of miscarriage and should be treated with birth control drugs in time. If the value of HCG progesterone is low, you should take progesterone orally or inject progesterone intramuscularly in time to keep the pregnancy alive, pay attention to bed rest, do not exercise strenuously and do not be too nervous to avoid unsuccessful birth control. In the middle and later stages of pregnancy, if there are signs of preterm labor, you should go to the hospital for ultrasound examination to determine the fetal heart, you need to pay attention to observe whether there are uterine contractions, if caused by uterine contractions, you need to use drugs to inhibit uterine contractions, magnesium sulfate or Ampoule to inhibit uterine contractions to play a role in fetal preservation.