Urine Test Concern

I had to go get a prejob urine test. I smoked ONCE on friday, saturday and sunday. I hit the bowl 3-4 times each time. Leading up to my test (on the same smoking schedule) I purchased the First Check home kits. In 4-5 days after smoking on this same schedule the test showed a negative result.

The day of my test (4 days after I last smoked) I used the at home kit first thing in the morning. It also showed a negative result. I'm a "bodybuilder" and I consume a gallon of water daily, exercise 5 times per week, take my vitamins and other supplements. My question is, do you think this seems realistic? Clean 4 days later? I'm hoping that all three of the tests I purchased weren't bunk.....

Any comments / opinions on my situation would be appreciated.

Thanks

Its possible. I've got a relative 89 lbs 5'8" and she can be clean in 24 hours. Pisses me off.lol It would take me atleast 2 months.