The location of the pain in the stomach during contractions varies from person to person because of the different weeks of pregnancy and the individual differences. If a woman has a contraction in the first trimester that leads to a preterm miscarriage, the location of the pain is mainly in the middle of the lower abdomen, corresponding to the pubic symphysis. If a woman has a contraction in the middle of pregnancy that leads to preterm labor, the pain is usually around the belly button or in the abdomen above the belly button. If the contractions occur after the full term of pregnancy, the pain is usually felt throughout the abdomen and in some cases is accompanied by significant lower back pain. Especially in women with a posterior uterus, when contractions occur, they will press backward on the lumbosacral nerves and cause severe lumbar pain, so when a woman has a contraction, it will not necessarily cause stomach pain, but may also be characterized by severe lumbar pain. Therefore, after the onset of labor in late pregnancy, women who do have severe pain and have no other contraindications can use the guide to relieve the pain of pregnant women.