Positive hpt but negative blood test

Caitlyn

Does anyone have a clue as to why I would be getting positive urine tests and have had 2 negative blood tests? Doctor doesn't seem to care as to why I'm continuing to get positives at home and pretty much thinks I'm crazy. No matter what brand I take I've gotten a positive. All of them are faint and never get darker so I don't think I am pregnant but something has to be going on right?!?

Thanks for any advice!