What could be wrong?!

Hayley • Luke 7/15/17; Colt 6/14/19; #boymom 💙💙
Ok ladies, so now I'm 2 days late still no AF but  I just took a test (it's currently 5:45pm)  and it came up negative. Shouldn't it be showing positive by now? The only thing I can think that may have screwed with it is not enough urine ( I really didn't have to pee so there wasn't much) or the fact that it's not fmu. But I would certainly expect that being 2 days late it would show even without fmu.?I'm going crazy here! I'm always 28 days on the dot for the last 5 cycles since I came off bc.  And now I'm on cd30 going on cd31 tomorrow! Help!