A patient presents for routine postpaum examination 2 weeks after a normal vaginal delivery with complains of foul smelling vaginal discharge with fever. On abdominal examination, a tender 14 weeks uterus is palpable, breast examination is normal and episiotomy is healthy. What could be the possible diagnosis?
Choriocarcinoma Adenomyosis Fibroid uterus Subinvolution of the uterus