A 26-year-old woman presented to ER with recurrent right lower quadrant pain, nausea, and vomiting. This time started 1 day ago. The pain has gradually improved over the last 2 hours. Review of systems is unremarkable. On exam, there is right iliac fossa (RIF) tenderness and rectal examination also revealed right-sided tenderness. Her temperature was 37.2C. The WBC was 8,500/ml. What is the most appropriate next step in management?