Could this be implantation? Not due to start for 10 days

I’d say that is old blood. Implantation bleeding would be closer to your period. I’m guessing you’re about 4dpo with being 10 days out from your period? I had implantation bleeding around 2-3 days before my period was due with this baby

If AF isn't due for 10 days it'd be a little early for implantation bleeding. Implantation occurs 6-12 days after ovulation which is why its usually mistaken for a light period.

How many dpo?