help me???

Lorraine

so I think I'm 13 Dpo but I have implantation bleeding. At first i thought it was my period but it was just off cause I have irregular periods that can last for weeks but I've been spotting one day and off and the next day back to spotting for 2 more days. so I have been taking pregnancy test and I see faint positives on what I think is my 12 and 13 Dpo. my question is, do you think I ovulated later then when i thought i ovulated? so am I really at 8 or 9dpo?