The left side of the uterine cavity during pregnancy means that the position of the gestational sac in the uterine cavity belongs to the left side. In early pregnancy, you should pay attention to the ultrasound to review the situation of the gestational sac, the position of the gestational sac belongs to the left side of the uterine cavity, does not determine whether the development of the fetus is normal. If the gestational sac is fully developed and slowly occupies the entire uterine cavity, the development is normal. However, if the gestational sac gradually grows to the left side of the uterine horn, it may be a pregnancy in the uterine horn, which is an abnormal situation and more dangerous. It may cause rupture and bleeding, leading to shock and other symptoms. Therefore, during pregnancy, you should do a close review and observe the growth of the fetus. Pay more attention to rest during pregnancy and avoid strenuous exercise. For more information, a doctor’s visit is required.