Decidual Bleeding?

Meg

I've read a fair amount of women having implantation bleeding, but not much decidual bleeding where you bleed after implantation. Did anyone experience this?

I swear I saw a faint positive, but then have had very very light spotting today. I know it can't be implantation because there would be no way the hcg level would recognize but maybe it's decidual?

Curious if any had that before...