.5 Xanax on 6-10-13

I forgot to mention that I was able to go 7 days without a Xanax before I had to take  it. I'm getting slack in recording my intake. I shouldn't do that. The lexapro is a daily non-habit forming Rx. Xanax IS habit forming. I want to avoid that habit. This past Monday, 06-10-13, I took the .5 Xanax. Before I took it I did try and look up the last dosage for Xanax. I could not find it in any if my calendars or diaries.