By the time you reach the 18th week of pregnancy, you are about 5 and a half months pregnant. The belly has increased in size and the woman will have to adopt a new posture to maintain her balance. The weight gain can cause lower back pain. In addition, the growing baby will put pressure on the bladder, increasing the urge to urinate.
In addition, the uterus may press on the intestines and cause constipation. Spots begin to appear on the skin, especially in the face area.