I too have GD and I am still diet controlled no insulin! This is also my third pregnancy but my first time with GD so I have done a lot of research into induction. At my 36 week check up the doctor said I wouldn't be induced unless I went the usual 10 days over my due date.
They did an ultrasound and said the baby is already roughly weighing in at 3.7kg and has a massive head (lol) Even with bubs being on the larger side they are happy to let me be!
I personally was ready to refuse induction anyway if they had of suggested it, I have birthed 2 babies spontaneously naturally drug free before and they were both 3.7 and 3.9kg so I don't have small babies anyway! Unless your sugar levels are sky high and the placenta is not functioning as it should then there is no reason to be induced from all the research I have done!