Aww sayang, 39 weeks and no signs yet is totally normal, baby will come when ready! Since you have GDM on diet control, your doctor will monitor closely and decide on induction based on your blood sugar levels and baby's wellbeing, so trust their timeline rather than worry yourself now. A few of my mum friends went past 40 weeks without drama, but definitely have that conversation with your OB at your next checkup so you know the plan, they'll scan baby's weight, check your sugars, and give you the real picture. Try not to stress too much (I know, easier said than done!) because stress won't help induce anything. You're almost there!