Peth test?

Hi guys, my case manager told me that 'I will be getting a blood test' prior to starting work on march 24th (got a clinic job and I'm really lucky and thankful for that!!) So I got a PeTH test the second week I was in the program and it came back positive... I mean, I'd barely gotten sober so even my case manager said she expected it to be positive. Welp she says I have to get another one between now (March 1st) and when I start work on the 24th. I relapsed on Feb 14th and had 2 mixed drinks... do you think that will make this PeTH positive as well? I'm not sure what the time frames are on this test. I'd been 100% sober prior to that relapse, for months, and I've stayed sober since that date. I'm not sure exactly WHEN I have to take the test... I did an Option 2 UA yesterday so I'd guess in a week or two. Do you guys think I'll pass the PeTH? Because of the drinks on Feb 14 (my manager does know about that incident just FYI). I hope she lets me work regardless of the PeTH test result... I've been waiting almost a year to gain employment as a nurse again so it'd be an astronomical bummer if she didn't let me work bc the PeTH was positive. ? What are your thoughts, guys?