Nooo, don't do that to yourself. Honestly.
First you haven't done anything wrong. Your placenta is just being a dick to your pancreas. That's all. It's a combination of bad luck and bad genes that make you prone to it.
Secondly, the vast majority of babies born to women with GD are totally fine. The vast majority of babies born to women with type 1 and 2, which are harder to control, are fine.
You know about it now; you can control it. You and the baby will be fine. Problems are caused when sugars are wildly out of control. And yours would have been picked up way before now if they were. Eg:
If you were dangerously high, your urine samples would have shown glucose and the midwife would have spotted it
You would have noticed constant thirst and peeing
The scan would have shown up issues
So don't worry. Yes you do need to take control of it, and yes that's going to bore the tits off you and you'd give your a for chips and a mars bar - but you can do it!
Another good eggy breakfast - just do a massive scrambled egg/omelette mash up, ie eggs with spinach, mushrooms, onions, peppers, cheese and pesto. You'll be full for hours and racing through your 5 a day.