Pregnant or not?

I am five days late on my period. I am usually never late. Always right on time. I took a pregnancy test. Recall blue dye test. The test is a +/- one. I had a very faint - line and a dark control line. So my question is, should I take another pregnancy test since I had such a faint - line or does this just mean I'm not pregnant?
Pregnant or not?
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