You are called to a maternity ward to see a 23 year old primi patient who had delivered a 2.7 kg baby boy 2 days back.She had a normal vaginal delivery and placenta delivered spontaneously. Now she complains of bloody vaginal discharge with no other signs. 0/E you notice a sweetish odour bloody discharge on the vaginal walls and introitus.Sterile pelvic examination shoes a soft non tender uterus.Her P/R-78/min, B/P-110/76 mm of hg, temp-37°C,R/R-16/min. Her WBC count =10,000 with predominant granulocytes. What is the most appropriate step: