Bleeding in the 6th week of pregnancy without abdominal pain may be related to the low location of the fertilized egg, and may also be caused by cervicitis, vaginitis and other diseases. 1. Low fertilization position: If the fertilization position is near the cervical opening, the uterus may gradually become bigger with the growth of time, which may easily lead to the detachment of the gestational sac and the uterine wall, which may lead to localized bleeding. 2. Cervicitis: Cervicitis is often manifested as increased secretion of leukorrhea, gray, yellowish, etc., which may also be accompanied by a peculiar smell; in addition, abnormal vaginal bleeding may also occur. Its causes are mostly related to the infection of mycoplasma genitalium, trichomonas and other pathogens, vaginal flora disorders, hormonal imbalance may also induce the disease. 3. Vaginitis: Vaginitis is mainly manifested by changes in the color of vaginal secretions, such as gray-yellow, yellow-green, etc., and may also be accompanied by a small amount of vaginal bleeding. Its causes are mostly related to low estrogen level and local pollution. If bleeding occurs during pregnancy, it is recommended to go to the hospital in time for examination to clarify the cause of the disease and follow the doctor’s instructions for treatment.