Six Aimstrip (IC) pos , 2 FRER negative, 1 walgreens invalid HELP

AF due today. So confused. Every day since Monday positive IC but negative on the FRER and clear blue. Any thoughts? I called Obgyn and they said they use those same strips and so I probably am but to test with the drugstore tests day of missed period. Today I got positive IC for the fifth time but then later I took walgreens and it was invalid. Maybe urine was diluted. Advice?? Positive thoughts?! Thanks ladies ?