Hj, I had GDM with my most recent pregnancy. I ended up being on insulin but only a small amount. If you can control it with diet alone the chances of bub being macrosomic or having any other probs is extremely low.
I had a section, but it was due to a few factors, including the fact i was on insulin and also the fact that my first birth was a section so they were reluctant to induce me. Bub was on the bigger side but not huge 3740gms.
There is a gestational diabetes support thread here:https://www.bellybelly.com.au/forums...atter-6-a.html

best of luck babe, you and your bub will be okay