I agree. My friend was in a very similar position, she smoked often for years and years, got laid off, stopped smoking for about a month, then cracked and smoked a bowl. Two weeks after she smoked she found a very attractive job offer and had to take a test. Passed with no problems.
If you're really worried and want to set your mind at ease, just buy a home test kit. And if you are really, really paranoid, they have kits that will mask the THC in your pee for an hour after you use it -- works well if you know exactly when your test is going to be.
Hope this helps.

Peace.