Failed in 1 hour blood glucose test

Canp
I failed in my 27 week blood glucose test with 175. I had crab cake and fire cracker salmon and a health drink with no sugar the previous night. I also took the prenatal vitamin. I was also not drinking enough water. Not sure if all these lead to the higher result. This time am planning to
go for a protein dinner the previous night.  How likely am I to pass my 3 hour blood tolerance test? Should I take my prenatal the night before. ? Please advice.