I failed an alcohol urine test taken on Wednesday. I had drank about 3 mixed drinks the night before. I have to take UA on Saturday morning by 11 am but I only had wine cooler Friday at about 4 pm... Will EtG still be present

Yes. Dirty first and probably second. Lesson not learned the first time?

ETG remains present in the body long after your BAC has reached zero. Are you expected to abstain completely?