bleeding after positive opk

Jess
Hey ladies-- I'm not sure if this is the right place to post this so forgive me if it's not-- but I need some advice. I'm 10 months postpartum and haven't had a period yet. I've been EBF but my son is starting to wean so I've been taking opk to see when my cycle would come back. I got what I'm pretty sure was a positive opk on Sunday of this week, so 6 days ago. Today I had some bleeding, not much, and a mix between red and a little brown with some mucousy type discharge. Im not sure if it's my first AF after baby, or if it could possibly be implantation bleeding? Has anyone else experienced this and what was the outcome? For those of you who had implantation bleeding, how many days post positive opk was it? Thanks for any help!