A 23 year old G1P1 woman is five days post- operative from a Cesarean delivery for arrest of labor at 7cm. She now complains of minimal abdominal pain and drainage from the right side of the incision. Lochia is normal, and she has no urinary complaints. Her vital signs are normal, and she is afebrile. On physical exam, her lung and cardiac examinations are normal. Her abdomen and uterine fundus are nontender. She has tenderness along her Pfannenstiel incision extending 3 cm from the incision, and there is serous, bloody drainage coming from the right side. What is the next best step in the management of this patient