How soon will a blood test show if you are pregnant?

Answer 1

I called and asked my obgyn, and she said a blood test would only be accurate two weeks after your missed period and to only do it as a validation of a home pregnancy test.

A blood test shows before you've missed a period, but at this early stage you would have to have 2 blood tests to show that the hormones are rising as there is quite a variation in normal, and a single test would not show you are pregnant.