Bleeding during pregnancy, but no stomach pain. If the bleeding occurs in the early stages of pregnancy, it may be due to endocrine disorders. Some people may have bleeding when they are pregnant, due to genetic influences, when they are due to menstruate, but they do not have stomach pain. If painless bleeding occurs in the middle of pregnancy, it is considered to be caused by placenta praevia or marginal placenta praevia, which needs to be confirmed by ultrasound. If the bleeding is heavy or repeated, it may cause anemia, which not only affects the health of the pregnant woman, but also affects the growth and development of the fetus, leading to intrauterine growth retardation and, in serious cases, may lead to fetal abortion.