I'm sorry your going through this. It's hard having your mind set on something, especially having your mind set on the moment your gonna meet your beautiful babe.
Everyone I've ever spoken to, birthplan has never gone accordingly. Once you hear that cry, I promise nothing else will matter :)
I had gestational diabetes with my first at 32 weeks, and this pregnancy I found put at 14 weeks. It's a struggle. Especially I'm doing everything right, and I still have to take insulin. My frost I was induced and had to have a c-section. And this one I'm just opting for the c section.
As long as the babe and I are healthy. I don't care how we get their :)
I was the opposite of you, they tested early for me so I found out at 9 weeks. Just eat healthy (try to lower carbs don't cut out completely, up protein, eat at regular times, don't eat all day long) do light exercise (walks, household chores such as vacuuming, sweeping, and mopping, park far away from store doors so that you have to walk a little further!) and follow what your doctor suggests! Don't focus on the negative aspects, Google will scare you to death! Good luck at your appt, sorry about your birth plan just stay focused on the baby! When it comes to your diet I want to really stress not to go crazy and cut things out completely! You and your baby need carbs and sugars, but just lower the amount! I found it good to eat my proteins and veggies first then eat my carbs, I eat fewer of them that way. I cut out all sugary drinks so the sugar I have is all natural sugars from the food. Just make the changes and stay positive!!!!
my first question is how high are your blood sugars? If they are only slightly high, then the chances of complications / bigger baby are quite low.
For now, you still have a few weeks left to go. Control your blood sugar very well in the next few weeks and this should also help reduce your risk. Avoid sweets and sugars, and reduce carbs. Eat plenty of non-starchy veges and meats (all of which are healthy anyway).
I am also assuming that your midwife hasn't noticed anything else abnormal, so chances are everything is fine.
let us know..