Early Pregnancy Symptoms of Girls: Physical Changes of Pregnant Mothers in the 12th Week After about 12 weeks of pregnancy, the uterus of the pregnant mother enters the abdomen from the gastric pelvis through the upper end of the pubic bone. After the uterus enters the abdomen, the pressure on the bladder is reduced, but the ligaments supporting the uterus shrink, which may cause low back pain. If you touch your belly, you can feel that it is obviously bulging. During this period, the phenomenon of early pregnancy reactions in pregnant mothers…