Hi, I Ate A Half Cookie At A Friends Not

Hi, I ate a half cookie at a friends not knowing they put marijuana in the cookie. That is why I stopped at half when they told me! I have to take a drug test for a job I was offered I need bad! This cookie consumption took place Sat about 9am so tomorrow morning it will be 3 days ago. My guess is they want me to take the drug test this week. My friends, family, past boss know I would never do that and tempted to just go in and tell them. It was not my choice :( Will my test come back positive this week? 5'4 136 pounds