Fail one hour glucose Test!

Berenice • I'm 23 mother of two beautiful girld 7,4 year old ...newborn baby jonathan born July 3rd 2016
Went in for my glucose test and my number was 150 :/ im so worried im scheduled for a 3 hour test next week im so nervous i have no info over gestational diabetes :( i know this can go away after dilivery can this harm my bby during pregnancy? Any info would help