The 29th week of pregnancy already belongs to the late stage of pregnancy, at this time the redness may be caused by preterm labor, placenta praevia, etc., or cervical diseases, the causes of redness are different, the duration of redness varies, as little as a few hours, or more than a continuous period of redness. If you are in your 29th week of pregnancy and experience redness with abdominal pain, you may be experiencing preterm labor or placenta praevia, and the redness may last for a few hours or longer than that. If there are no symptoms of labor, the redness may be caused by cervical diseases, such as cervical polyps, cervicitis, etc., which may cause bleeding, and the redness usually lasts for a shorter period of time, and may only appear as a brownish discharge that disappears within a few hours. Regardless of the cause of redness, you should go to the hospital as soon as possible to complete the relevant examinations and take treatment as soon as possible, so as not to affect the fetus and the health of the pregnant woman.