dexamethasone suppression test help

[Luu2018]

Hi

I took 1mg of dexamethasone at 11pm,

At 12:30pm I then ate 2 pieces of toasts and a chocolate bar !!

I now think I’ve messed the test up I’m meant to be going to doctors at 9am for the test

Will it affect the blood test much ?? I’m being tested for cushings disease