If the amount of blood in the stool in early pregnancy is relatively small, it usually will not affect the fetus; if the amount of blood in the stool in early pregnancy is large, it may cause anemia in pregnant women, which may affect the fetus. Blood in the stool in early pregnancy is usually related to the growing fetus and the enlarged uterus. The enlarged uterus presses on the large intestine, resulting in poor blood circulation and slowing down the peristalsis of the large intestine, which in turn affects the function of defecation, resulting in dry stool and difficulty in discharge, and then triggers the onset or aggravates the symptoms of hemorrhoids and anal fissures, which can cause blood in the stool in early pregnancy. If the amount of blood in the stool in early pregnancy is relatively small, manifesting as blood on wiping paper or dripping blood, and there is no feeling of swelling in the anus, the bleeding will stop after the stool, which usually will not affect the fetus. The bleeding will stop after the stool and will not affect the fetus. If the bleeding in the early stage of pregnancy is large and lasts for a long time, it may cause anemia, which may affect the development of the fetus and may lead to fetal failure. If the bleeding is accompanied by anal swelling and vaginal bleeding, you should go to the hospital in time to clarify the cause of the blood in the stool, carry out targeted treatment and, if necessary, carry out fetal preservation treatment to avoid preterm abortion. If you have recurrent blood in the stool that cannot be relieved by self-treatment, hospital consultation is recommended.