A 28-year-old female presents to the ED with acute onset right lower quadrant pain. She reports nausea and vomiting. Her last menstrual period was 6 weeks ago, and she denies any vaginal bleeding. She is hemodynamically stable. A CT scan of the abdomen and pelvis is performed, with a relevant image shown. Considering the clinical presentation and the imaging findings, what is the MOST appropriate next step in the management of this patient?