Dear WellGrounded,
Congratulations, and welcome to the club!
For anybody else for whom protein in the urine is an issue: I had this not long before my donation, and the nephrologist who was my centre's medical director was NOT amused. She wanted to disqualify me, but I negotiated a "stay of execution" according to which I had to have three perfect re-tests, which thankfully I had.
I think in my case what caused the test result was some combination of the fact that I had just increased my exercising, and had also eaten lots of tofu, just before my urine test. Apparently, either can throw off this test.
That said, I'd also stress that a genuine issue of protein in the urine is no joke, and should be very carefully investigated before somebody donates.
Good luck to all!
Snoopy