I agree with Steve...the blood is to be expected and you absolutely should have been told. I think most good doctors would provide that key info ahead of time.
Not to be paranoid, but with the med student angle do you really want to go back to the original doc for the answer? Or, at least, go for another opinion if you are not completely satisfied with what he says. As you undoubtedly know, some in the medical profession will not be entirely forthcoming about mistakes...
Jim