GD..missed dose of insulin

Hi ladies,
​So a quick question for those who have gestational diabetes and are taking bedtime insulin....what happens if you skip a dose?
​I really struggled today (needle phobia)...and for some reason could not get the needle in!! I tried four times and finally gave up out of frustration. Im on a bedtime dose of 8 units, and im 39+1 weeks. 
​Is it gunna make a drastic difference??