implantation bleeding

Ty.
I was wondering when do you see the implantation bleeding if you did get you BFP after ovulation. My boobs have been hurting for a few days now. I'm like on DPO 2 or 3 and I experienced a light spotting today. I'm trying to figure out if that means my body did something lol. I have PCOS and it's very hard to figure out when my body does something 😀