I have GD and was diagnosed at 14w. At the moment it is under control (finally!!)... My OB is brilliant and although we have discussed the posibility of a big baby he is not considering any intervention with me until I am 7 days late. The only reason he is considering intervention at this point is that he:

a) Doubts I'll get that far anyway and will go naturally, possibly early. (too many health problems with me... GD, SPD, hypermobility, cervical stitching (due to SPD), Strep B Kidney Infection (since 6w and related to existing kidney health issue, unable to treat properly due to pg) plus degenerative kidney disorder, dormant Murray Valley encephalitis. )

b) He is scheduled for leave around when I would be 10 days over and would rather deliver himself and be still working during my hospital stay. The replacement OB's on at the time are not very good (in his opinion) and would not be supportive of my wishes or my health concerns, prefering to just do a c/s (which all my specialist are totally against as I would need a full anaesthetic and this is very risky) or have delivery restricted to a bed.

When we discussed the whole GD/big baby thing he said that if I wanted I could have an u/s at about 35 weeks but the weight estimates of those are extremely unreliable and he would rather not induce early because of a calculation based on information which tends to not always be accurate.

Even my main renal specialist who to quote him "can't wait until this bloody baby is born so I can start treating you properly woman" is against an early induction under any circumstances besides kidney failure.

So I think I am lucky... OB against induction, other white coats against induction... everyone (including me) happy for nature to run her course.