In the 8th month of pregnancy, the vague pain in the stomach is mostly caused by contractions, because at this time there will be pseudo contractions, there will be a slight pain in the stomach, and accompanied by the phenomenon of hardness in the stomach, the contractions are usually not particularly long and irregular, and the pain in the stomach is not particularly intense, which is a normal physiological performance. During this period, you should try to rest in bed and not to exercise vigorously. If the pain in the stomach is more serious, regular and longer, it means that it is a real contraction, which may be a phenomenon of preterm labor, so you should go to the hospital for examination in time. Under normal circumstances, the fetal heart rate should not be lower than 120 beats per minute and not higher than 160 beats per minute. If this range is exceeded, it means that the fetus is suffering from intrauterine ischemia and hypoxia, so it should be promptly administered oxygen to improve the symptoms.