Hi Haley,
I loooove coke! I drank up to 2 cokes a day while pregnant. (advised by my dietician as a safe amount of caffine while pregnant) Yes, I was also insulin dependent. I calculated the number of carbs from the coke into my meals to determin how much insulin I needed at that meal and I never had high numbers post meals. My doctor said I was doing a good job if I was within the range of 80-140 two hours post meals. Now, Abby was born with low blood sugar and low birth weight, 4#11oz. Most "diabetic mom" babies are big! Well, Tom was born with zero problems and he was kinda large, 7#6oz. Abby didn't need any interference with her blood sugars. But we fed her formula in the NICU every 3 hours. After 5 days when some blood tests came back (not sure what they tested for) she was released and we all came home as a family. I was 38 weeks with twins, and never went into labor. I think my first internal exam was 36 weeks. (I can't remember for sure...sorry)
So, zero caffine, zero sugar, blah, blah, blah... I think they're ok in moderation. And in all honesty, when you're talking diabetes, it depends what you pair it with. If I drank a coke by itself my blood sugars would have been in trouble. Skyrocketing and plummeting. But I was very careful to add protein and vegies to my meals to avoid these pitfalls.