In all my pregnancies I am classed as high risk to get GD. My first pregnancy I was the strictest and did Low GI diet from 7 weeks onwards. 2nd Pregnancy bit slack, this pregnancy am trying to be good but sometimes a bit slack havent had the GD test yet will in 2 weeks time.

With both my pregnancies before this one I avoided GD by eating low gi most importantly was:
Breakfast
Sourdough or wholegrain bread/toast (wholemeal or white bread is too high GI)
milk or yogurt
piece of fruit
was my daily breakfast
or bacon and eggs without bread is best too.

Lunch
Salads (made by myself)
add a protein (fish you can only eat 2 days a week) so add chicken or cooked ham or bacon
again sourdough or wholegrain bread only

Dinners
Are the hardest, yoiu can have a medium or high GI food in your dinner however you must have mostly Low GI food in it to lower the high GI.
Measure your rice or pasta to be 1/2 cup uncooked at most (San remo pasta is the lowest GI) and Basmati rice is the lowest GI
I made lots of casseroles with veges in the slow cooker or curries with veges added on the side and fruit as desert

Snacks - yogurt, cheese, fruit (low gi ones such as strawberries, apple etc, depends on what you like), crackers (vita weets but not many of them), nuts but I am allergic but some are good to snack on if you like them.

I recommend also the book Mel recommends. It helps with recipes and the GI foods.

Ohh in Woolies you can get Low GI potatoes now special brand cant remember what they are called (cause all white potatoes are high gi) or you can eat sweet potato. Pumpkin is not classified as a GI some people say medium GI some say high depends what you read.

Hope this helps