A 23-year-old G1P1 woman is five days postoperative from a cesarean delivery for arrest of labor at 7 cm. 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 vitals are normal, and she is afebrile. On physical exam, her lung and cardiac examinations are normal. Her abdomen and uterine fundus are non-tender. 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?