Postpartum Bleeding

Adrian
I am currently 8.5 weeks postpartum. I stopped bleeding around 6 weeks. My doctor said everything looked great at my 6 week checkup. Then at 7 weeks, I started bleeding again and I'm pretty sure it was my period, even though I'm EBF, because I had the back pain that usually accompanies my period. That lasted for a few days and stopped. Then at 8 weeks, I started bleeding AGAIN after returning from a long walk. Doesn't seem like my period though...I don't know. Has anyone else experienced anything like this or know if this sounds normal? I'm so tired of bleeding...