If you haven't had a growth scan already they might offer one. Depending on the result of that they might want to induce you. I am still unclear whether I had it or not but I was tangled up with them at 38 weeks although never really told if I had it or not (blood sugar results were ok). I was induced at 40 weeks exactly and dd was monitored in case her blood sugar dropped but only for a day and that was fine too.
Meant to add don't worry. If you've been fine up till now I wouldn't stress too much. Presumably if you've got this far then your urine tests have always been ok so I really wouldn't worry. I did but then I was clueless. If I had my time again knowing what I know now I'd be a lot more relaxed about it. Really.
Why have they tested you now? Have you had any symptoms?
I felt fine even though I was on insulin.
If you're worried about the birth, I fully understand that. I was disappointed when I found out that I would probably be induced (I was). I had peaceful and calm births with dds - It took me a while to resign myself to not having the birth I wanted but it was a birth I could actually have more control over iyswim?