31 weeks of pregnancy, calculated on the basis of 4 weeks and 1 gestational month is 7 months and 3 weeks. The number of weeks of pregnancy is usually calculated from the day of the last menstrual period, 7 days are counted as 1 week and 4 weeks are 1 month, which means that 1 month is 28 days. Therefore, for a 31-week pregnant woman, the number of weeks of pregnancy divided by 4 will calculate the number of months of pregnancy, which is 7 months and 3 weeks. The 31st week of pregnancy belongs to the late pregnancy period, when the fetus is about to experience a developmental peak and the fetal lungs and digestive system have basically finished developing. The fundus of the uterus has risen to the diaphragm, and pregnant women will gradually experience breathing difficulties, gasping for air with more effort, and eating with stomach discomfort. Therefore, after 31 weeks of pregnancy, if a woman has increased blood pressure, increased blood sugar, panic, dizziness and sweating, abdominal pain, irregular vaginal bleeding, etc., she needs to go to the obstetrics department of the hospital in time and follow the medical advice to give symptomatic treatment.