Hi I'm new and have a pass/fail question?

Hello everyone! This board is great, I love it. I have spent at least the last hour reading over all the posts and know this particular thread is done to death, but in all honesty everyone's systems are different so maybe someone provide their opinion for me.

Ok, I'm 5'3, 123 pounds, used to by hyperthyroid with monster metabolism (so awesome)...after treatments am now hypothyroid and on medication to give me a "normal" metabolism...so not too sure about how my metabolism is right now. Moving on...I interviewed and drug tested for a job March 6th after being 45+ days not smoking, home drug test negative, so all good...well went back for a final interview last Friday (assumed that meant I passed everything)...low and behold I smoke Friday night (only 2 hits off dirt weed blunt - yeah low tolerance, ha ha), Tuesday they call me and say they need me to come back in, some HR stuff was forgotten...I had a sneaky suspicion they needed to re-do the drug test. Wednesday a.m. I drank a liter and 17 oz of water, peed 3 times before arriving and they tell me, we need you to re-do the test (liars, glad I followed my intstincts though) they said the first drug test came back diluted, which was weird because I didn't do anything that it should have been diluted...but ok. So I pee in the cup and it is more yellow than clear, but light yellow. On my way home I picked up at home marijuana drug test kit at 50 ng/ml, pee this time though was basically clear, immediately came back negative. Total 5 days between smoking and peeing, what are my chances of passing? I know, a lot of ambigiuous info, but please help.