The thing is, secretlife, your baby doesn't get a day off from being in the womb, they are relying on you not to send them too much sugar as if they get too much they have to produce more insulin for themselves which is a growth hormone.
If you failed the GTT then you have GD - it's a progressive condition so will probably get worse as you go on. If you keep diet controlled, that's fantastic but if your levels get worse (the overnight fasting levels are the hardest to control as they are hormone driven), then medication such as Metformin or insulin will help keep them within targets.
Please look up the Gestational Diabetes UK website (it's on the front of your orange notes) and the Gestational Diabetes UK Mums Facebook group, there's so much helpful information. Great recipes too, including a fantastic chocolate cheesecake and chocolate brownie recipe, so you can have some treats!
Often the NHS advice re diet isn't really suitable for GD, as most women can't tolerate things like cereal, many fruits and toast, which the NHS advice promotes. I have kept my mealtime levels within target by following the '8 golden rules' like eating slow release carbs paired with fats and protein, drinking lots of water, walking after meals where possible. It's just my fasting levels which I have struggled to keep under target without medication.
I'm 35 weeks now and been diagnosed since 27 weeks - it's been really tough at times but I want to make sure my baby arrives as healthy as possible so that gives me the motivation to keep going.