Extended period 60+ days

I am 21 years old and have had my 2nd child in may of 2015 and I am still bleeding since postpartum. The doctors have tried hormone treatments but no success so far. Currently have light spotting and have the implanon (implant birth control) since July of 2015. My blood work comes back clear, my uterus is thinned out, and nothing is contributing to the bleeding factor. Any ideas? I still want a little boy so keep in mind please. I don't know what else to do.