eCup Test in 2 days

Hello friends... I was wondering if anyone has any experience with escreen ecup testing. I was clean from 12/3/12 - 12/31/12 ( I smoked on New Years Eve ) then I also smoked a bowl on 1/12/13 and a small joint on 1/13/13. So i have been clean right at two weeks and I have and ecup drug screen on 1/29/13. I am a little paranoid. I have taken 2 drug tests from CVS and a very faint line says I passed. I have been drinking a ton of water and 100% cranberry juice for 2 days and taking cranberry pills for 2 days.
Does anyone have any advice? Thank You!

Oh I am a 24 yr old female, 5'7 weighing about 170.