L.M.
I'm a little confused. I had GD, which was diagnosed early on in the pregnancy. Other than meeting with a nutritionist once, there we no specialist. I followed a diet, check my blood sugar levels several times a day, and met with my OB on a regular basis. Towards the end of the pregnancy I did need to have an extra ultrasound.
So I guess the answer to your question is, if everything is going ok and you are able to manage your blood sugar on your own then do so. However, the health of your baby is what matters more than anything else and that has to be top priority.