Still a chance ?

AF is due tmrw & im getting pms as usual. I did a test with a One Step pregnancy test this morning & defo a faint pink line appeared. I wasnt convinced enough so bought a FRER in the afternoon and tested with that ( drank a lot of water & teas) and it's a BFN. So confused 😣 Shouldnt i still have a faint line showing on FRER even with diluted urine ? 😩