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Anyways, if there were two lines then that would mean it detected the hCG in your body which would only be there if you injected it (like a trigger shot) or if you are pregnant. The only things I can account for the fainter line is that the test is defective, your embryo was a late implanter so your hormones are lower, the test you took is not very sensitive and needs higher amounts of hormones to show the second line or (and I hate to say this one and don't think it is it) you have a chemical pregnancy and your hormones are dropping (I am praying that is not it but I needed to be honest with my thoughts on all the different things that could be going on).
Again, I think you should call your doctor to know for sure. A blood test will tell you one way or the other. I wish you the very best of luck and hope it is a BFP!!! :-)