I guess I was lucky - I had my nipples pierced (14g cbr) about 6 weeks ago with no real problems - a little bit of spotting, a little pus, a pissed off nipple here and there. But they're fine, now.
For you, though - I've heard that there CAN be heavy bleeding occasionally. Do you have problems with bleeding, otherwise? I mean, are you taking Coumadin, aspirin therapy, or any other blood thinners - or have naturally slower-coagulating blood? That could contribute...
Unfortunately, I have nothing else of value to add, but I thought I'd put that idea out there.
Good luck!
-Kris