30th April 2024

A 30-year-old woman presents to the emergency department with acute onset of unilateral pelvic pain and light vaginal bleeding.

A 30-year-old woman presents to the emergency department with acute onset of unilateral pelvic pain and light vaginal bleeding. Her last menstrual period was six weeks ago, but she is unsure if she might be pregnant. She denies any fever, dizziness, or shoulder pain. Her vital signs are stable.

Which is the most appropriate initial diagnostic investigation in this patient to rule out an ectopic pregnancy?