Possible Pass?

New here so please bear with me.

Physical Background: 20, low body fat, average metabolism, active (college student)

Smoking Background: I started in May of this year maybe buying between a half a gram to a gram and making it last a week. My last dates of smoking:

-Sat Oct 13 - bought a .5, smoked it amongst 3 other people
-Wed Oct 17 - bought a .5, smoked half with a friend
-Thurs Oct 18 - finished the remaining half
-Tues Oct 23 (FINAL DAY) - bought a .5, only hit 4 times, gave the rest away

Okay Tuesday (Nov.22) which is exactly 28 days from my last smoke date I took a preemployment non-DOT test at Labcorp (pissed midstream). I havent recieved a call and results have not gone to my employer as of yet (I was guessing due to the holiday weekend?) Im scared shitless right now. The only thing keeping me sane is that I took a home test on Nov. 8 (18 days after last smoke date) and it was negative. I got the call for my first interview on maybe October 30 so i went into full gear. The two weeks before my home test i did water and niacin pills (not sure if they cleared me or just naturally.) Ive read through threads that the cutoff for THC was 50ng/ml. Im almost certain i passed but I have doubts....help?:(