I agree with the last comment. They should not be allowed to sell them. I never ever buy them. I guess if no one bought them they may stop! Its strange though as i assume they all work the same way?
I hope you get the answer your looking for, the bleed may be implantation, if you get nothing else test again in 2 days.
If the Dr does a test and its neg, dont count yourself out as the Drs tests are not as sensitive a home ones.
xxxx