27 weeks pregnant discharge from dark brown to light red considerations are preeclampsia, placenta previa state, cervicitis and so on. 1. Pre-eclampsia: If the pregnant woman has some serious systemic diseases, such as serious infections, serious diseases of other organs, or the presence of malnutrition, etc., it will affect the normal development of the fetus, resulting in pre-eclampsia, and there will be a small amount of vaginal bleeding, abdominal pain and other manifestations. 2. Placenta previa: If the lower edge of the placenta covers the endocervical os, or is closer to the endocervical os, this condition will also have bleeding, usually with the lower part of the uterus stretching, bleeding will become more and more frequent, and the amount of bleeding will also increase. 3. Cervicitis: women with cervical inflammation, especially with cervical polyps, at this time there will be abnormal vaginal bleeding, there will also be symptoms of increased secretion of leukorrhea. The secretion of the 27th week of pregnancy from dark brown to light red, there may also be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.