This can cause damage to you, as you know, and the baby is at risk of damage if glucose levels are uncontrolled, especially during the first trimester when initial development is happening, and during the last
trimester when the placenta needs to be well-nourished by the small blood vessels
in your body
in order to sutain the larger unborn baby.
Most doctors now recommend that their diabetic patients try to have good glucose control for a period of about 3 months before getting pregnant.