Pregnant women holding back urine is harmful to themselves and the fetus. After pregnancy, the uterus enlarges, it will squeeze the bladder resulting in a decrease in bladder capacity, women may experience frequent urination, not timely discharge of urine often hold urine, on the one hand, is not conducive to the self-purification of the bladder, which can easily lead to bacterial infections of the urinary tract, on the other hand, long-term urine holding, the bladder is too dilated, which affects its function, and may lead to urinary retention, and in severe cases, it may appear as a ureteral hydrops of the kidneys and cause renal function damage. The enlarged bladder after holding in urine may stimulate the uterus, causing uterine contractions, pregnant women experience abdominal pain, vaginal bleeding and other discomforts, which may cause complications such as preterm labor or miscarriage, which is not conducive to the growth and development of the fetus. Drink plenty of water during pregnancy, urinate regularly, and if you feel unwell, it is recommended that you visit your hospital’s obstetrics and gynecology department to avoid delaying your condition.