Although I can't say for sure, I'm pretty sure I read an article somewhere (maybe NORML) that weed doesn't stay in most people's systems for as long as previously believed. Chances are, it will only stay in your system for a couple of days or so (if the article was right). To be safe, I'd guess that as long as the test is a couple weeks away you likely won't have any problems. Just don't smoke though, as others have said it's the safest way.