The early stage of pregnancy is a critical period for the development of the embryo, and it is recommended that pregnant women avoid strenuous exercise as much as possible in the early stage of pregnancy, so it is not recommended for pregnant women to run in the early stage of pregnancy. The reasons why running is not recommended for pregnant women in early pregnancy are as follows: 1. The embryo has just completed the process of implantation in early pregnancy and is still unstable, so running is a kind of strenuous exercise, during which the embryo may detach from the endometrium and miscarriage may occur. 2, in the early stages of pregnancy, pregnant women due to the early pregnancy reaction, the body’s physical strength is weakened. Therefore, running at this stage can cause unnecessary damage due to physical incompetence. However, during pregnancy, it is not impossible to do any exercise. Currently, it is advocated to do light physical exercise during pregnancy, such as walking, light limb training and so on. These exercises can not only play a role in exercising the body, but also keep pregnant women in a happy mood. It should be noted that running in early pregnancy does not necessarily lead to the above-mentioned adverse consequences, but pregnant women need to pay attention to rest and observe abdominal pain and vaginal bleeding after running. If there is any abnormality, you should consult the local hospital in time, and if necessary, seek fetal preservation treatment. As mentioned above, pregnant women should not participate in strenuous sports such as running in early pregnancy as much as possible.