Confused???

Im not sure if i've ovulated early this month and have been testing and have been getting faint positives on opk's since last week today i noticed brown discharge when i went bathroom and havnt noticed anything now im on cycle day 23 but confused what this could mean?i have wacky cycles that range from 33-45 days and not sure when i ovulated However i did notice alot of cramps around cycle day 14-16 if i did ovulate early could this possibly mean implantation bleeding? Has anyone experienced this plz help