I think that on average a HPT takes 3-4 days to become positive after an implantation bleed, so even with the super early ones you might have to wait until 11 dpo or so to test. If you have an early implantation then it's possible to get a positive HPT at 9dpo, but if it was IB then it takes a few days for the HCG to build up in your blood. The timing sounds good for implantation bleed so fingers crossed for you!

Good luck