If that scan is correct your not doing too bad size wise.

I also had GD with first bub and had a scan at 33 weeks - she was estimated to be 6lbs exactly then. She was born three weeks later and weighed 7lb 3oz - so assuming that she put on about half pound per week (which is about right at the end) her ultrasound estimate would have been very close to her actual weight at the time.

Unfortunately with GD even if baby isn't "big" they will still want to find all sorts of reasons to induce. They just like to get them out around 38-39 weeks because they start to worry about placental deterioration. If you want to avoid induction I'd suggest getting a plan in place for regular monitoring in the last few weeks etc because I can pretty much guarantee you that regardless of bubs size they will start pushing for an induction just because you have GD. It's just the "standard" model of care at the moment.