I'm confused

I had two positive hpt, but a negative blood test. My obgyn told me I can test again in a week or two if I'd like, but blood tests are definite. I asked if anything caused a false positive and my doc didn't have an answer for me. Wasn't an evap. Wasn't expired. Do you girls think its even worth testing again at this point? Or should I just let it go?

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I see some of you are talking about a chemical pregnancy, but even if that was the case, I have no way of knowing.. do I?