I took one Percocet 12 days ago for pain, I have a cdl and am taking a urine test for work. Is it out of my system? I'm not a chronic user.

Percocet. After 12 days I would suggest that this is totally out of your system.
Not to worry. If your exposure the drug was only what you described, your urine test should be clean. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex.