Review Question - QID 216500

A 33-year-old G1P0 woman presents to the emergency department at 8 weeks gestation with a 2-hour history of abdominal pain and cramping. She says that she was lying in bed when she started experiencing abdominal pain. She went to the bathroom, where she experienced the passage of blood and clotted tissue. Prior to this episode, her pregnancy was uncomplicated and she was receiving appropriate prenatal care. She has no other medical conditions and takes no medications other than a multivitamin. Her temperature is 98.6°F (37.0°C), blood pressure is 115/70 mmHg, pulse is 110/min, and respirations are 18/min. A physical exam reveals a closed cervix. Transabdominal ultrasound shows only a thickened endometrium in the uterus. Which of the following is the most appropriate description of this patient's spontaneous abortion?