I'm new to this forum, but have had some experience diluting in the past, and have been reading the hell out of this forum for the last few days.

From what it sounds like to me, you'll have over a month clean after only smoking for 2 days, correct? If thats the case, I think you're pretty much in the clear man. From my experience (In the military, i was clean for a few months, smoked heavily for a couple days, and still managed pass a random test only 5 days later with some last minute water chugging to dilute my sample), if you're already clean and you only smoke a little, that shit is out of you in a week tops. Its the consistent smoking that makes it build up in your fat cells and hang around for months on end.

Anyway, I'm no expert, but hopefully thats a little reassuring...

Still definitely get some home test kits, and follow the dilution sticky or a slightly toned down version of it, and test yourself. My guess is you're probably already clean and clear after 18 days, and with even more time to spare, you've got nothing to worry about.