I honestly think you’ll be okay now that we are four days out from the drink and you couldn’t possibly be tested til Monday, IF you got selected. I collect urine and blood for Affinity where I work (I’m not allowed to test there, I only do it for local doctors and pharmacists in monitoring contracts.) I will tell you this, but I wouldn’t worry about a peth as much as I would have about a straight urine drug screen last week. ETG can show up in it up to 80 hours later. A peth is designed to detect multiple servings for up to 2-4 weeks after ingestion. From what it sounds like, you didn’t ingest enough to show on that.
Now this may sound like overkill, but I’ve not even ordered a ‘virgin’ drink since I’ve been in monitoring. To me, unless I can see the drink being made and it doesn’t leave my sight until it’s served to me, there is always a chance it might have alcohol. I’m not paranoid about food or other things like vanilla or hand sanitizer, but until I’m out of monitoring, I will just stick to soda, juice, and water. I was really nervous at first that people would notice I wasn’t drinking at weddings, ballgames, etc, but nobody has ever lifted an eyebrow. I actually had a ready-made excuse if someone asked but have never had to use it. 😂
ETA: I’m 2.5 years in and I’ve never had a peth test.