Accused of Academic Dishonesty

So I just had my English final yesterday and we had a substitute. I finished in less than half an hour, with more than an hour and a half to spare. On the board, it said to read after finishing. However, at this time, a did not have a book and everyone around me was playing games on their computers. I started off by using my computer to study for my AP Physics final the the next day and in the last half an hour I started to play games. The substitute even let us use our phones in the last twenty minutes.
Today my teacher sent out an announcement announcing that people in my period have “pending honor code violations.” What should and can I do in this situation?

First step is to actually talk to the teacher. It seems that a serious miscommunication occurred somehow.

Nothing you can do until you find the details. You may not be involved at all.

I agree with @RichInPitt How do you even know you’re the one accused of an honor code violation? Wait and see what happens.