That is exciting!
But I'm actually surprised your doc had that info in the file... Usually if you tell them you don't want to know at the ultrasound, they don't even record it as it has no medical relevance... I've also heard that they purposely don't record it so that there are no "oops" on the parts of medical staff -- things like asking "how the little boy is doing" when you don't know the sex...
I don't think this is the case everywhere. My sister was team green with her first, she had to go in for an emergency c-section, when the doc came in to tell them he said "so are we ready to deliver your little girl?!"