The slight sighting of blood in the 33rd week of pregnancy will depend on the cause of the sighting to determine whether it is important or not. If it is due to placental abruption, low placenta, preterm labor, etc., it is important. If the bleeding is caused by cervical polyps or other reasons, it is usually not important. However, it is necessary to pay attention to sufficient rest, avoid exertion, and if necessary, it is recommended to go to the hospital for polypectomy treatment. However, if the pregnant woman is due to microbleeding caused by placental abruption, placenta hypoplasia, preterm labor and other reasons, this situation is more serious. It may lead to severe hazards such as labor hemorrhage, preterm labor, and fetal distress. Therefore, if there is a slight bleeding in 33 weeks of pregnancy, you must go to the hospital in time to check and consult the doctor, and if there is any abnormality, take effective measures in time to avoid causing more harm.