Altho its been a while for me I do remember still bleeding at my 6 week Post partum check up.... so i know its not uncommon to still bleed anywhere from 6-9 weeks... annoying I know ... but normal
Heavy bleeding can be quite normal, as you resume your periods. You can have a rough time during the first few months trying to get everything regulated. It will get better though.
hmmm - did your doctor say anything to you at your 6-week check up. I heard that it was normal to bleed 6-8 post partum - but I would mention it to your OB at your 6 week post partum checkup and if you already went - call and let him know -they are glad to take questions over the phone (at least mine is) and they will let you know if they want to see you or not. HTH