TMI Period Question

So I just had my period, but its been a bit bizarre. Instead of blood, it seems like black peices of what i assume to be lining from my uterus. It's flaky like if you erased something with an old eraser. I am a camgirl, so this is a problem as I sort of need my vagina and some is stuck inside of me still... I have an IUD if that helps. Has anyone else had this with their period? I've always avoided douching to avoid messing with my ph balance, but should I?