The symptoms you have mentioned happen in neuroapthy due to diabetes but these occuring in mouth are a bit strange. Tingling
, numbness of hands and feet are the usual complaints and happen when a patient of diabetes has uncontrolled blood sugar levels.
Still to ensure everything is fine you should consult an endocrinologist
for the same.
Besides this its your first pregnancy
and a high risk one too as you are case of gestational diabetes
. So i would like you to see your obstetrician regularly for antenatal checkups, keep a proper record of your daily blood sugar levels fasting and post meals.
Maintain a diabetic diet with foods having low glycemic index
keep a record of your weight.
Excess weight gain is not a good sign and should alert you.