A 24-year-old woman presents with right lower quadrant pain, nausea and low-grade fever. She has localised peritoneal tenderness. Pregnancy test is negative. What is the most appropriate next diagnostic step?AReassure and discharge without imagingBOrder abdominal and pelvic CT scan with contrastCOrder transabdominal and transvaginal ultrasound of the pelvis and right lower quadrantDTreat empirically with antibiotics without confirming diagnosisEOrder colonoscopy urgentlyCheck my answer