A 24-year-old female, gravida 0, presents to the office for follow-up of suspected endometriosis. Her last menstrual period started two days ago. She reports a three-year history of chronic pelvic pain that is worse during menses, is moderate to severe in intensity, and crampy in nature. She has tried combined oral contraceptive pills without symptomatic improvement. She denies fever, changes in bowel or bladder habits, or dyspareunia. She is sexually active with one male partner. She uses condoms regularly. She has no history of sexually transmitted infections. She has no significant past medical or surgical history.