Thanks for the replies, guys.

I do have a 24/7 walmart in my area, but I'm kind of too nervous to check seeing as how my test is tomorrow morning either way, if that makes sense.

Thinking back on it, it was only 2, not 3 hits. And I mean Teeny, TINY puffs. The first one, I don't think I even really got any at all. The second one I got like a two-second inhale, that was IT. And the way it was set up, I'm not sure how to describe it, but I think it was pretty non-powerful in the first place? Like when my friend was smoking it, I wasn't even sure whether it was weed or something like flavored tobacco, because there was barely even the scent of weed.

I didn't get a high feeling at all. I didn't even notice any physical changes.

It was five days ago, and so far, everything I've seen on Yahoo Answers (I've read questions from similar-situation people) indicates I should be okay, because normally amounts that tiny are gone from someone's system within 2-3 days. Does that sound about right to you guys?
Mind you, it wasn't like "one occasion of taking turns finishing a joint and getting mildly high." It was literally "two itty bitty two-second hits, didn't really feel the weed going in, not sure if I inhaled the right way in the first place, did not feel an inkling of high-ness."

And it was 5 days ago.