That was my thinking exactly. This is still pretty inline with what happened in my last pregnancy too. SUPER faint test extremely early, followed by a negative, then multiple slightly darker ones a week later, I called my dr very confused over these mixed results and when they gave me an US at the appointment, tada! 5 weeks. I had originally thought I had ovulated earlier too, which led to my confusion over earlier results as well. Only difference was no bleeding in my case. I was crazy nervous at the time too, but I guess that sweet little baldy nursing in my display pic just decided to drive me nuts by making his debut as a tardy egg.
Have you given any thought to the blood test?