Ovulation help

So i started my period on aug 20th I am still be spotting thought my period was finished guess not.. I have been taking Opks cd10 and I got a positive I believe on cd11 but I'm still spotting is that even possible? But now I only get a faint ish line. I'm so confused.. Help!!!! I took clomid on days 5-9 also I don't know if the clomid is the reason for the positive opk test or not? First time with opk and clomid