On the 5th day after labor body temperature of a parturient suddenly rose up to 38,7°C. She complains about weakness, headache, abdominal pain, irritability. Objectively: AP- 120/70 mm Hg, Ps- 92 bpm, to- 38,7°C. Bimanual examination revealed that the uterus was enlarged up to 12 weeks of pregnancy, it was dense, slightly painful on palpation. Cervical canal lets in 2 transverse fingers, discharges are moderate, turbid, with foul smell. In blood: skeocytosis, lymphopenia, ESR - 30 mm/h. What is the most probable diagnosis?