I don't think its safe in my opinion(but u can still ask your gynae if u want ).. even i am not fasting even though i dont have gestational diabetes.. i just need to eat well for baby's growth ,i wouldn't want a low baby birth weight later on .. anyways pregnant woman are excused from fasting.. just do it next year :)
I recommend that you don’t. Having diabetes makes your blood sugar prone to be too low as well, especially if you don’t eat regularly and take your medicine. Take care of yourself and baby this year, and take part in fasting next year:)