Problems with the schedule....not my fault or is it?

I'm a nurse at a small nsg. home and work from 10 pm-6am. I work Sun, Mon, Tues and every other Wed. I worked last Wed. I got off work at 6am this morning and have been awake for 26 hrs now. The nurse that is waiting for her relief to show up called and said that I'm on the schedule to work tonight. I haven't looked at the schedule in 2 yrs because my days have never changed. I called the nurse that should be working and explained I worked last Wed. so he should work this Wed. Am I wrong or right? I know I'm wrong for not looking at the schedule but I never needed to. If someone was calling in I was usually asked if I could work. Also...I was going to ask the other nurse if he could work for me one day next week but there is noway I can do that now....they are all mad at me!!