A 28-year-old woman delivers vaginally and, 20 minutes later, has a sudden increase in vaginal bleeding, estimated at 900 mL, with a soft, boggy uterus on palpation. What is the most appropriate immediate first-line management?ABegin high-dose oxytocin infusion and uterine massageBTake her immediately for hysterectomyCAdminister tranexamic acid onlyDWait and observe for spontaneous uterine contractionEStart prophylactic broad-spectrum antibioticsCheck my answer