A 20-year-old woman presents to the sexual health clinic. Her history includes trichomoniasis and irregular menses. Her last menstrual period began 4 days ago. She states that her periods are heavy and last between 2 and 9 days. She has an intrauterine device (IUD) in place for birth control, and she does not wish to change her current method of birth control. She is on an antidepressant. On arrival, her blood pressure is 108/74 mmHg, pulse 75 bpm, respiratory rate 18 breaths/min, and temperature 98.2°F (36.8°C). She is 5'7" (170 cm) and weighs 190 pounds (86 kg) (BMI 29.75 kg/m). The client is waiting to be evaluated by the healthcare provider, and the nurse is conducting a detailed health history. Which aspect of the client's history requires further investigation by the nurse?