hbA1C is a measure of your average blood sugar over the last 3 months. 33 is in the range for a non-diabetic, so if your blood sugars have been higher than normal they haven't been so for long. They may also do something called a fructosamine test to look at your more recent sugars (2-3 weeks) but that excellent hba1c result is an indicator that your blood sugars have been OK up to now.
I'm a T1 so can't comment too much on your increasing insulin needs, except to say that during my 2 pregnancies my insulin needs went up quite a lot during the late stages of pregnancy and I'd expect this to be the same for GD folk. Good luck.