What is considered a dangerous fasting blood sugar during preg?

Gestational diabetes. In pregnancy, blood sugar can goup high...called Gestational diabetes. Normal fasting blood sugar is >60 mg up to 99 mg.if it is between 100-125 mg, it is prediabetes. Anything over 125 mg is considered diabetes. Dangerous levels are anything that is beyond normal range. .Ask your Ob to help you sort it all out and guide you further.