9dpo light spotting?

Bethany

I am currently 9dpo. I am on Metformin for PCOS and I did track ov this month and I did ovulate. I am 9dpo and I went to pee earlier and there was light (barely even see-able) blood. Could this be implantation? Wouldn’t that have happened sooner? I’m so confused. TTC 2 years.