I was 30w diagnosed. Managed. Baby always measured bigger than usual (US was correct on head and leg) and towards the end I started to get preeclampsia, and we agreed on a scheduled C-section for 39w (not just for GD, for other reasons). She told me they do not try to schedule them before 39w at that particular hospital unless absolutely necessary. However every practice is different but I have a feeling this is common. I don’t think they will try to get you to deliver before your due date/when baby comes knocking just because of GD, unless they absolutely advise it/completely necessary.