What are my odds?

First time poster here

I'm an infrequent smoker, and until last week I hadn't smoked in about 5-6 weeks. I smoked a spliff with a friend Monday night, took one hit on Wednesday, and another two hits from a joint on Thursday so I'm 8 days clean. I'm 5'11" and 140lbs, very fast metabolism and I've been exercising and drinking a lot of water + cranberry juice + green tea the last few days.

The test will probably be Tuesday at the absolute earliest, giving me 11 days. I took a UTest 20ng/ml test today (not first-piss, in the middle of the day without crazy amounts of fluids) and passed, but my google searches on this specific brand haven't really yielded any kind of reliability.

What should I do? I ordered test strips online but they won't get here until Tuesday. Am I safe? I'd rather avoid substitution, so will dilution even be necessary?

Just an update because a lot of these threads never get closure.

I'm a little skeptical of the UTest brand - I apparently passed 20ng/ml with flying colors after 8 days. I ordered some FastCheck II strips which came in today and was clean on the first void of the day without eating/drinking anything.

The test is tomorrow and I'm now confident I'll pass. Home tests go a long way towards alleviating stress - I was an absolute nervous wreck the first few days.

So yeah, in summary

5'11" 140lbs
Smoked probably on average 3 times a week, quit for 5-6 weeks
Smoked 3 times in one week
Passed in 12 days, although probably sooner I just couldn't verify