Positive dollar store test and neg clear blue digital

Brittany • Expecting our second April 2015 ?
So I'm expecting AF tomorrow , and I've been tracking ovulation . I've gotten 3 positive opks in the past three days . So I took a pregnancy test it was a very faint line that kinda made me question if I was making things up in my head (my husband said i was crazy ) but I know there was a line . So I went and bought another same thing !! But then I wanted to know for sure so I bought a clear blue digi and it read "not pregnant " what would cause this ???

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