system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 22-year-old woman comes to the physician because of a 1-week history of nausea and vomiting. She has not had fever, abdominal pain, diarrhea, or vaginal bleeding. She does not remember the date of her last menstrual period. She uses oral contraceptive pills but occasionally forgot to take them. She had pelvic inflammatory disease 2 years ago and was treated with antibiotics. Her temperature is 37°C (98.6°F), pulse is 110/min, respirations are 16/min, and blood pressure is 118/75 mm Hg. Physical examination shows no abnormalities. Pelvic examination shows a normal appearing vagina, cervix, uterus, and adnexa. A urine pregnancy test is positive. Her serum β-human chorionic gonadotropin concentration is 805 mIU/mL. Which of the following is the most appropriate next step in diagnosis?
assistant
Transvaginal ultrasound in 4 days