A 32-year-old G2P1001 at 20 weeks gestational age presents to the emergency room complaining of constipation and abdominal pain for the past 24 h. The patient also admits to bouts of nausea and emesis since eating a very spicy meal at a new Thai restaurant the evening before. She denies a history of any medical problems. During her last pregnancy, the patient underwent an elective cesarean section at term to deliver a fetus in the breech presentation. The emergency room doctor who examines her pages you and reports that the patient has a low-grade fever of 100degF, with a normal pulse and blood pressure. She is minimally tender to deep palpation with hypoactive bowel sounds. She has no rebound tenderness. The patient has a WBC of 13,000, and electrolytes are normal. What is the appropriate next step in the management of this patient?