I drank 1 cup of crown on Friday night. Saturday, I drank 1/2 a cup. Those are literally the measurements. I have not drank since Saturday at 2 pm. I may have a urine screening for alcohol on Thursday. Im 153 pounds. How likely am I to pass?

Four full days should be sufficient to pass all alcohol from your system

You should be fine as was said, barring any health issues.