A 35-year-old multiparous woman with a copper IUCD (inserted 3 years ago) presents with complaint of heavy menstrual bleeding and severe dysmenorrhoea for the past 6 months. She denies fever, abnormal discharge, or pelvic pain between periods. Pelvic examination is normal; no masses or tenderness. Urine pregnancy test is negative. What is the most appropriate next step in management?