A 24-year-old woman, who delivered a healthy baby three days ago, presents to the emergency department with severe lower abdominal pain, an elevated temperature of 38.6°C, and an unpleasant-smelling vaginal discharge. Which of the following would be the BEST initial nursing action?
Administer broad-spectrum antibiotics after obtaining cultures
Obtain a CT scan of the abdomen and pelvis
Monitor vital signs every 15 minutes
Perform a detailed pelvic exam