It is normal to have a vague pain in the stomach in the ninth month of pregnancy, which is not particularly obvious. This is because in the middle and late stages of pregnancy, the fetus grows faster and will tend to make the uterus grow faster, which will involve pulling on the uterine ligaments and cause slight pain. During the enlargement of the uterus, it will compress the blood return to the inferior vena cava, resulting in poor return flow, which may also cause mild stomach pain. During this period, it is important not to stand or sit for long periods of time to reduce the pain in the stomach. In the middle and late stages, there are also pseudocontractions, a pain in the belly that occurs in bursts. This is a pseudo contraction, which is also a physiological manifestation.