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The most common symptom of placenta previa is vaginal bleeding that is bright red and not associated with abdominal tenderness or pain, especially in the third trimester of pregnancy. However, each woman may exhibit different symptoms of the condition or symptoms may resemble other conditions or medical problems.
The placenta is normally implanted into the wall of the uterus where there are many blood vessels that supply the baby with oxygen and nutrients. With placental abruption, the placenta becomes detatched from the uterus, and bleeding may occur. The symptoms of placental abruption include: 1  vaginal bleeding.