with my first baby i bled on and off around the 6 week mark and it too looked like clotting. It turned out it was all normal and i was cleaning out my system. I had a c-section but it still wanted to go through the cycles??? not sure?? BUT then 6 weeks later i found out i was pregnant...

but i'd get a second opinion. ALSO contact the hospital where you had bubs and talk to one of the nurses on staff on the ward you were on, I did and they helped me out more than my doctor did.