I have a sensitive drug test for coming up in a few days. i was exposed to secondhand marijuana smoke for maybe 15 minutes in a room with a window open. it will have been four days since i came in contact and will take a urine test. will i pass?

Likely: From what you described, you should pass the test, unless you have more contact with MJ between now and the time when urine sample is collected. Have a healthy diet, exercise 30 minutes/day, drink plenty of water, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Get HPV vaccine. Wish you good health!