By a dark colour, what does that suggest, according to the chart on the pot? When you say all you are eating are vegetables, what did you eat today (Sunday.)?
My experience of urine testing by Diastix is that they are pretty short lived in their usefulness. They tend to only show up very high sugars, so as you grasp control, they show no sugar, but that isn't accurate enough.
If you are newly diagnosed, I would suggest you go back to your Doc or nurse and ask them if they can explain your findings, and ask them for blood glucose finger prick testing kit. It sounds like torture, but you soon get used to it, and it doesn't hurt. You only need liberate the tiniest droplet of blood.
By using that form of testing, you get a much clearer and more consistent view of what's going on.
In the meantime,drink plenty of water, as that all helps wash everything through, and we often neglect to drink enough when we change our diets.