Occasional hardening and tightening of the stomach during pregnancy are pseudo contractions, which are physiological in nature and usually do not lead to fetal hypoxia. However, if there are frequent contractions, it may easily cause fetal hypoxia, in the fetal hypoxia will show fetal heartbeat is not normal, the normal fetal heartbeat should be between 120-160 times per minute, beyond this range indicates that the fetus has intrauterine hypoxia performance, should be timely oxygen. If you feel that the fetal movement is not normal, you should go to the hospital for fetal heart monitoring to confirm the symptoms of hypoxia and improve the symptoms with timely oxygen intake. You should try to keep your mood relaxed, do not have too much pressure, not overworked, should be moderate activity.