Gestational diabetes result

Hey everyone.. I’m a first time mom.. I’m very concerned and confused at the moment. I did my 1 hour glucose test however when I got my labs back my levels were 136 and the passing level was 140 . Today I went to my 28 weeks appointment and was told I failed my 1 hour glucose test by 1 point because the passing limit is actually 135 😢 now I have to do a 3 hour test. How do I prepare for this ?

Update: I passed my 3 hour test!🥳