I've had that happen with my T several times. I'm one of her last appointments on Thursday, she doesn't work on Friday. So, if she's going to be out of the office for a long weekend, it happens shortly after my appointment. There have been times where I receive a mass email at the end of the day on Thursday, notifying that T is out and when she'll be back. It's generally like Chris suggested - T is so intent on being with me in my session that she doesn't always remember to notify me that she's not going to be available until the next Tuesday. So, I find out a few hours later when she sends out the mail.

It's nothing personal...or perhaps it is, but in a good way. What I mean by that is that T is so invested in being in the moment with me during my session that she forgets to tell me about her plans. It's not intended as a slight against me or as a way to be deceitful.