ABSTRACT
A 22-year-old woman attends the emergency department complaining of abdominal pain. She is 7 weeks 4 days pregnant by certain menstrual dates. She had a normal vaginal delivery at term 18 months ago. Her periods are usually regular every 27 days, with bleeding for 3-5 days. She has no previous gynaecological history. Her medical history involves mild asthma and two episodes of cystitis.
