A 27 year-old G2P1 at 18 weeks gestation presents to the emergency room complaining of fever, nausea, vomiting, and mid-abdominal pain for the last 24 hours. For the last 12 hours, she has had no appetite. She has been healthy, but reports that her 3 year-old son has had diarrhea for 2 days. Physical examination reveals a blood pressure of 100/60, pulse 88, respiratory rate 18, and temperature 102.0°F (38.9°C). Abdominal examination reveals decreased bowel sounds and tenderness more pronounced on the right than the left. Which of the following is the next best step in the management of this patient?A. Check a complete blood countB. Abdominal and pelvic ultrasoundC. Plain abdominal radiographD. Helical computed tomographyE. Graded compression ultrasound