Last min prep??

Vaped high thc till about 1 month ago. Doing 13 panel urinalysis tomorrow morning at 8am. I’m 23 F and weigh about 130lbs.

Got the faintest negative yesterday on at home 50ng/ml test. The line was almost imperceptible on one of the tests, but definitely faint tho apparent on the other. So I want to ensure that it stays negative for the real thing.

Any last minute tips?