Review Question - QID 210083

A 22-year-old G1P1 woman comes to the clinic asking about “the morning after pill.” She had sexual intercourse with her boyfriend last night and she thinks the condom broke. She is not using any other form of contraception. Her last menstrual period was 10 days ago, and they are normally regular. The patient’s medical history is significant for obesity, asthma, and allergic rhinitis. Her medications include albuterol and occasional intranasal corticosteroids. She has no history of sexually transmitted diseases and is sexually active with only her current boyfriend of 5 years. The patient denies genitourinary symptoms. Her temperature is 98°F (36.7°C), blood pressure is 112/74 mmHg, pulse is 63/min, and respirations are 12/min with an oxygen saturation of 99% O2 on room air. Physical examination, including a pelvic exam, shows no abnormalities. The patient is worried because she is back in graduate school and cannot afford another child. Which of the following is the most effective emergency contraception?