How do blood pregnancy tests work, and what does less than 2 mean?

I had a positive blood test for pregnancy, but a negative home test. Which test is right?

My pregnancy blood test was negative. Why did it detect HCG? Can the redo test be positive?

When can pregnancy be diagnosed with a blood test and a urine test?

My home pregnancy tests are positive, but my blood test and ultrasound show nothing. Why?

Why did I have a positive home pregnancy test, but negative urine and blood tests?

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If 4 home pregnancy tests were positive, why was my urine test at the doctor's negative?

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Can I still be Pregnant if my home pregnancy test is negative?

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