A few questions about what to expect… First UA ever, very nervous

Just wanted to say thank you to all of the knowledgeable people on this board. I’ve been clean for 17 days and have spent probably 100 hours on this website since then.

I’m getting the faintest of lines on my home test strips, and have a pre-employment test as early as Monday. The form I was given to take to the place is marked "pre-employment," "Non-DOT (non regulated" and hand written on the form by the HR lady I met with she wrote "instant 5-panel DS". I plan to dilute but I have serious social anxiety (esp. since I cant smoke!!!) and knowing most of the details of what I’ll be walking into will help.

First off, I’m wondering what questions I will be asked before I give my sample. I’m not worried about any other drugs, although I do tend to grab any pain reliever I can when I’m experiencing cramps.

My brother told me that they used to ask him "have you smoked marijuana in the last 30 days?" and "have you been around anyone" who smoked mj in the last 30 days. I don’t want to sound like a total idiot, but should I say that I have been around it??? Any other "trick" questions I should expect?

Another question - If my instant test comes back "preliminarily positive" - its my understanding that it is then sent off to a lab for further testing? Is that right? So lets say that this occurs - Will ANY amount of THC be a "fail" or will anything under 50 ng still be passing?

Lastly, can someone tell me if aspirin is still part of the N2 protocol? Can anyone tell me what role aspirin plays in the process? I’ve done a few dilution test runs (minus the aspirin) and still getting what I really think is just a "ghost line." Will my home tests be stronger if and when I use the aspirin?

Thanks in advance for any input. I cant wait until this is all over with. I’ve never been so (literally) sick over something before in my whole life.