Generally speaking, bleeding in the sixth week of pregnancy without abdominal pain is not normal and may be caused by miscarriage, vaginitis, cervicitis and other reasons. 1. Pre-eclampsia: Bleeding without abdominal pain in the sixth week of pregnancy is a manifestation of pre-eclampsia, which may be due to the lack of progesterone, the location of the fertilized ovum is relatively low and other reasons, pregnant women should consult a doctor for examination in a timely manner, according to their own situation to preserve the fetus or treatment. 2. Vaginitis: when a six-week pregnant woman suffers from vaginitis, the vaginal mucosa is stimulated by inflammation, which may lead to mucosal damage, causing vaginal bleeding, vaginal itching and other symptoms. 3. Cervicitis: when women develop cervicitis or cervical polyps after pregnancy, vaginal bleeding may also occur, and a few patients are also accompanied by an increase in vaginal secretions, lumbar and abdominal pain, vulvar itching and burning sensation. It is recommended that pregnant women seek timely medical examination, clear the cause of the targeted treatment, pay attention to personal hygiene in life, to keep the private parts of the local clean, dry, and change underwear, and at the same time on time to see a doctor for maternity examination, and so on.