faint lines no period day 10. DIURETICS FALSE NEGATIVES

Been testing since Sunday and faint lines. Making myself crazy. Wasn't trying to conceive so wasn't expecting to have this on my mind but here I am on cycle day 36 when I usually start on 26 but even at a 28 cycle (which I never start on 28, but benefit of the doubt) I would be 8 days late. Cheapies giving faint lines everything else is negative. Did a little research and bam diuretics can give false negatives EVEN with fmu. Well that makes sense I have been taking these since February. On top of the gallon + water I drink everyday.