which condition is characterized by painless vaginal bleeding in the third trimester of pregnancy?

Mrs. Santos, a 32-year-old pregnant woman at 34 weeks gestation, arrives at the emergency department with sudden onset of vaginal bleeding. She reports feeling abdominal pain and notices that the bleeding is bright red. Her blood pressure is 140/90 Mmhg, pulse rate is 110 bpm and she appears pale and anxious.