i have been taking 5mgs of sub for the past 3wks, just had a urine screen by a dr. it went to the lab to be annalyzed sooo i gave my self 8days before my urine screen... do u think i will pass it?? plzzz someone help!! im on pain meds i have severe back pain..have been on percs for 4yrs..i run out early at times, need few more pills..have days i feel awful, taking sub helps... cant loose my meds... plz help with an answer!! thx! i know i shoulldnt be taking the sub, it helps when i run out... im in pain daily it sux!!