in that short a time frame, i kinda doubt it will be out of your system completely in time.
this may sound off kilter to try, but something that has worked for people i know is http://www.azoproducts.com/ . (i dont remember but it's either the original or the red box one) take a bunch, drink a bunch of water, and make sure you do it long enough before the test that the uti medicine isn't in your system still. i haven't had to do this personally, but it does work as far as i know.
it sucks but i've been in the position where i was screwed by the i was in the car and accidentally inhaled someone else's j smoke levels in my system. why take the chance?
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