A 21 year old lady attends the Early pregnancy assessment unit concerned she is having a miscarriage. She noticed light spotting today and has lower abdominal pain. She has done a home pregnancy test which was positive and her last period was approximately 8 weeks ago. On examination, she has pelvic and adnexal tenderness. Her temperature is 37.0 degrees Celsius, pulse is 85 beats per minute and blood pressure is 119/75 mmHg.
What is the most appropriate next step in management?