I have type 1 diabetes. I was diagnosed at 18. I was a gymnast for all my life and in great physical shape. Actually, when I was diagnosed I was almost sickly thin (but that is kind of what happens when you have undiagnosed diabetes you are starving yourself without knowing it, amongst other things). Don't worry just yet. Do you have any other unusual symptoms that would point to diabetes?
I'm keeping my fingers crossed it's just a fluke.
UTIs on their own are no fun as it is!