It is relatively normal for the stomach to be hard and tight at 38 weeks of pregnancy, mainly because the fetus is gradually developing and the uterus is gradually enlarging, causing the uterine ligaments to gradually stretch, so there will be hardness and tightness, and even abdominal distension and pain. It is recommended to supplement some trace elements, such as calcium, to relieve. Special attention should also be paid to a balanced diet and a good routine must be followed. If there are contractions from irregular, gradually regular may be approaching labor, then you need to promptly seek medical attention.