The article Tanya posted is good but misses one important factor: until you know exactly how your body reacts to exercise, it's prudent to carry fast acting glucose tablets with you.
Even though I know how I react to exercise (I don't eat prior to exercise, because as a type 1 on a pump, I'm able to compensate with a lower basal rate of insulin prior to exercising, and I'm trying to lose weight), I ALWAYS carry my glucose meter and testing supplies, my cell phone, and glucose tablets. Better safe than sorry!
Carbohydrates will bring it up more quickly than the protein and healthy fat containing nuts so if it is on the rise now and you are feeling ok, you might wait a little while longer and then check again because it should continue to slowly rise. I would encourage you to print out this article and keep it handy to help you keep your blood sugars in check before, during and after exercise.
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