Implantation bleeding?

I'm about 7-10 dpo. Having some light bleeding and a bit of on and off cramping. I was expecting AF later in the week I.e Friday. How much/little should implantation bleeding be?

I also have Breast tenderness and I wake up hungrier than usual, occasional nausea.

I habe PCOS and hyperprolactin which I am taking medication for. Am I hoping against hope?