A 26-year-old female patient complains of abdominal pain. The pain is generalized to her abdomen and worsens when walking. She also tells you that she is having a foul-smelling, yellow-colored vaginal discharge. The primary assessment reveals no threats to the airway, breathing, or circulation. Her vital signs are pulse, 104; respirations, 16 breaths/min; blood pressure, 108/60 mmHg; and oral temperature of 102.1°F. She finished her last menstrual period three days ago. Which condition do you suspect?