Theres no telling where you stand because each persons body is different. There are too many variables to take into consideration in order to accurately determine how long it would take for the body to rid itself of THC. Thats why periodic home testing is important.
Take one more home THC test 3 days before the scheduled U/A. Be sure to test the first urination of the day. If youre still failing, then you may want to consider making preparations for dilution, specifically creatine-loading. Read up on N2's Dilution 'sticky' thread for tips.