Miscommunication

I work at CVS as a pharmacy technician. Since school has started, I've really scaled back on my hours. Typically I just work on Mondays. One week though, my bosses scheduled me to work on Sunday. I had told them I was willing to work on an occasional Sunday, just to let me know. Well, no one let me know I was scheduled. So, at about 12:10 I received a phone call asking me where I was, did I know I was supposed to work. I had to hurry straight into work. I felt so embarrassed that I wasn't there on time! There were no "reprocussions" other than that. The pharmacist working was very chill about it and so was my manager.