6 days late

I know hpt says not to read after 10 minutes.  However, I'm 6 days late and keep getting BFN. I took one today, waited the 3 minutes and saw nothing.  I figured it was another BFN.  Well, I just checked it again (just incase) and there is a very faint line.  The test one the left was taken yesterday....obvious BFN, the test on the right is the one I took today.  Pic was taken about 3 hours after testing.  Opinions?