I ate a brownie after exercising; will my blood sugar go up?

I had some brownies that an acquaintance made themselves yesterday.
I wanted to eat it so much that after finishing my morning workout
I cut it in half and ate it. If you eat it right after your workout.
Will my blood sugar go up more than usual?
Will there be little difference whether I exercise or not and still take it?
 
It tasted good while I was eating it, but I regretted it afterwards.