Yeah, I’ve been there and know the freakout factor. In my case, it wasn’t from drinking, it was nasal spray, but I was in complete panic mode.
This is what you “HAVE” to do. You get in touch with your PO ASAP and be 100% honest. Tell him/her you messed up and had some drinks and blew the next morning and failed. The one thing PO’s love is honesty because they are lied to constantly. She is going to find out either way, so you need to get ahead of things and tell him/her yourself. Expect a punishment, but due to your honesty, you are a lot less likely to go to jail. Especially if you have been clean and cooperative. Everyone makes mistakes and they understand that, so honesty really is your best move.
Also, if you are going to drink on probation, remember they can test up to 80 hours after your last drink. You need to do the math before blowing into your device. If you had 5 drinks, give yourself 6-7 hours after drinking at a minimum. I would recommend 10-12 to be safe, but it takes your body 1 hour to process 1 drink. This also depends on your body size, so if you are super skinny, definitely go with the 12 hour time before blowing. If you are a big body type, you could go for 1 hour per drink then add 1 extra hour at the end.
And remember, I am not a lawyer, I’m simply giving you my opinions and my experience of having been through this. I also have many friends that have been through this.