Hello SOE..
I had GD in my first pregnancy, and have just had second GTT in my second at 27 weeks and am pissed off to find that I HAVEN'T got it this time.. Although it was a pain, there were so many silver linings that I would be quite happy to do it again... so don't worry!
Get to see a specialist diabetic team asap and remember that you are going to get much better care and attention than your average pregnant mum. Whats more, you are not likely to put on weight and won't have to wait forever at the end of pregnancy, since most people with GD are induced at between 38-40 weeks... I didn't ha ve a big baby, because the GD was monitored so carefully. She was 6lb11... (I am also 5'1!) I had superb care from a lovely team of midwives and personal attention throughout the final stages of pregnancy, lots of scans to make sure all was well, and 2 specialist midwives at the birth, while others were being shipped off to other hospitals as it was overcrowded. I had a natural birth (only gas and air), and though induction isn't great I think I was better prepared than most of my contemporaries - Of the 9 people in my NCT group, only the 2 of us who had GD ended up having natural births with no intervention! What is more there was great camradarie with others with GD - we were meeting up at the clinic every week and some of them are still friends today!
Most people seem to manage perfectly well with just managing diet. I didn't and within a few days i was on insulin and by 32 weeks was taking 60 mls of insulin in 4 injections a day - This was a pain (the needles aren't bad - just like a pen - but the needing to time your mealtimes so you can do the blood sugars and injections at the right time is annoying)...
And not being able to eat lovely cake in the third trimester felt unjust, but really it wasn't that bad at all.
GD is dangerous if not monitored and controlled, but with good monitoring and diet, it should be completely fine. The placenta tends to break down earlier, which is why many people get induced or that was the reason in my case, but the baby was (and is) absolutely fine and lovely. As soon as that placenta is gone, neither you nor your baby will have diabetes any more! (I had the mince pies lined up in the labour ward waiting for me!)
Of all the things that can go wrong, it is by no means the worst - It sounds scary, as diabetes conjurs up such horrors but it aint so bad at all.
Very good luck with it..
Although I am looking forward to a non induced birth this time around, I will not be disaappointed if it does happen again, so hang in there!