Hey, I have a drug test coming up for a job. they may be giving a 15 ng/ml test but i am not sure. the test is on the 27th, I have not smoked since the 6th so it will be 3 weeks. i smoked a couple times before that.. dates are

1 time april 23rd
1 time april 30th
1 time may 6th

it was only a casual weekend thing and only took a couple hits each time. before the 23rd i didn't smoke for over a month, I plan on taking a at home test tomorrow but that will only be a 50ng test.. so my question is should i be clean for a 15 ng/ml if they give it? I am 6'1 250lbs.. i am a little over weight but not to bad