If they didn't seem too worried, it might only be a trace they found - I've had the same, but further urine tests have been fine, and the diabetes clinic put it down to lack of food and drink.
Incidentally, since being on metformin, I've not even put on a stone from my pre-pregnancy weight, so if you're on any kind of medication like this, it may well be you're having the same as me.
Of course, I read the internet and freaked out - but then figured, if something was really badly wrong, then they would have been a little more concerned - so I wouldn't worry too much.
Funnily enough, now I've finished work, every single one of my readings is much lower. I just wonder how much stress is to do with higher readings... I know I'm taking much better care of myself now, and having better spaced out meals, rather than working around my work hours. Not sure how long you've got until you finish, but you may find that things suddenly calm down?
The main thing is, you're being closely monitored - try not to get too stressed out - and good luck.