I would say that before the bong hit, your body was clean. Even for daily/ultra frequent smokers 45 days is generally how long it takes to get the THC out of your body. So treat the bong rip as if it were your first time smoking pot, ever. In most situations a first-timer will only need a week-10 days to get the pot out of their system.

So you should be good if you can schedule your test with that in mind. Self drug testing is not a bad idea either.