In need of the cold hard truth.

First and foremost, everyone I know is telling me that I am being overly paranoid. Regardless, I may need a stranger to tell me this too. Here is my story; honest feedback is very much appreciated.

I was completely sober for 11 months. Over the summer I smoked a few puffs of mid-grade bud almost daily for approximately 5 weeks, at which point, I did not smoke for 2 months. In the beginning of September I smoked .5 gram of chronic over the course of 5 days, at which point in time I stopped smoking. 2 weeks later I had 1.5 small edible brownies that I nibbled on once a week until October 8th. 50 days later I dropped a UA. Here were my habits leading up to the UA/things I did to prepare:
-spent 50 days completely sober with absolutely no contact with second-hand smoke.
-took a detox product + fiber pills for approximately one month (this really had nothing to do with the UA and was simply a coincidence, I basically pooped my brains out for a month - gross, I know). I stopped taking them a few days prior to the UA though.
-took a good multivitamin + separate B vitamins for 4 months.
-spent the last 2-3 weeks partaking in some cardio for about an hour 3 times a week.
-made sure not to lose ANY weight for the 50 days leading into the UA.
-on the day of the UA, I drank approximately 1.33 liters of water, 1 small coffee, and a 16 oz diet coke. I voided 5 times before I took the UA, and when I took the UA, I collected a mid-stream sample. The sample looked like a well hydrated void with a light yellow color - very healthy.

A few more bits of info that may be helpful: I am 30 years old, weight 165 pounds, female, 5'6", regular metabolism. I AM NOT being tested at the 50ng/ml range. I'm one of the unlucky people who are being tested at 20ng/ml. I did not take an at home test prior to the UA for this reason (none of them test below 50ng, I felt it was a waist of money). It has been 3 days and I have not heard back from the lab. In the event that it comes up dirty, the lab calls and inquires about medications that may cause a positive result. 3 years ago I had smoked every day of my life, multiple times a day, for a number of years. I quite smoking and did a UA 3 months later (50ng/ml test), I tested clean.

How likely do you think it is that I will pass given what I described above? I realize that everyone is different and some people have tested dirty at 60+ days. I have read every scientific study there is on the topic, and overall think I am just being paranoid. Regardless, I am so worked up that it is making me sick and could use a different, honest perspective from a stranger (or 10).