I moved your post into "Non-Invasive Bladder Cancer" where more people who have had BCG will see it.
It is,of course, possible to get TB from BCG, but it is incredibly rare, and the case reports I have seen seem to indicate that it is not possible to prove definitively that the patient did not have asymptomatic TB before receiving BCG. Be careful of "Dr. Internet." The cases listed there are of interest because of their extreme rarity. Of course, this needs to be considered by a thorough pulmonologist which is why the question is on the forms.
Here is a good summary of BCG side effects
bradyurology.blogspot.com/2014/03/bcg-complications-for-bladder-cancer.html
Physicians learn in medical school a pertinent saying "If you hear hoof beats, don't think of zebras!"
Hope they don't find a zebra on Monday!
Sara Anne