Get the test done for sure. You probably wont have GD so wont have to worry about it, but if you do have it you need to get it under control. I had 3 high risk factors (over 40, over weight & family history) yet I still didn't have it. It was however a relief to find out I didn't have it.

I know someone who did have GD during her pregnancy & she could not control it by diet so please don't go blindly into the rest of the pregnancy thinking if you do have it unknowingly that a good diet will avoid it.