Slight bleeding during the 26th week of pregnancy is generally an abnormal condition, which may be related to the causes of pre-eclampsia and low placenta, and should be taken seriously in time. 1. Pre-eclampsia: Slight bleeding at 26 weeks of pregnancy is dangerous and may be due to partial detachment of fetal membranes and abnormal fetal development, which often leads to pre-eclampsia under certain circumstances. 2. low placenta: 26 weeks of pregnancy slight bleeding may also be due to low placenta bleeding, if the uterus irregular contractions, low placenta and uterine myometrium attachment surface peeling, and then cause local bleeding. Slight bleeding during the 26th week of pregnancy may also be related to other causes, if the bleeding symptoms are not relieved, or accompanied by other symptoms, you should go to the hospital in time, after clarifying the cause to give targeted treatment.