I am freaking out

I just got an offer for my dream job, but it requires a drug screen. I have never had drugs in my life, but on st patricks day, I smoked an entire marijuana with a friend. By my calculations this was 44 days ago, most websites say that this should be sufficient time to be undetectable, but does this take into account that I smoked an entire one?

What should I do man, I'm freaking out. Is this what I deserve for being reckless and crazy?

>>3,6
Where do you morons come up with this shit? Detection time for single use marijuana users is less than a week. For very heavy users it's about a month. That's it.