how did you accidently send the message? I'm a little confused
You should have thought of that before you sent it? Apologize immediately! ?
Apologize and of course say you'd never meant to send it, that is if you can't find a way to stop the message going through.
Try looking up to see if there is any way to stop it. I was just told there is a way to stop a message from being sent on your cellphone a few day ago (though I was not told how).