What to do about confusing pregnancy tests?

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Hi, a couple of weeks ago I took a pregnancy test and the second line appeared, although it was faint. I took another one today to be sure, but it said negative. However I read in a pregnancy book that if it has the second line, however faint that it’s a positive. Very confused now. Please help.

A LINE IS A LINE
I’ve read a ilne is a line no matter what! Call your obgyn.