I can't wait to hear the answers to this one. I think FBR would be able to answer this the best.
I have a shit load of home tests on the way and I hope to figure out what MY body does in that same situation. However, it is not an accurate measure since it's a pass/fail and the tests don't give you a number.
My gut tells me it compounds in your system. Your scenario might be too good to be true. But may be true for you and not for someone older, fatter, slower metabolism.