you might not have ever posted it if you can't find it in the top right where it says "questions" under your screen name.
When I first joined this site I kept asking questions that never got posted. This is because when you post a question it'll show "questions that are similar to yours," and then you have to scroll down to confirm your question.
I never knew you had to scroll down and confirm your question so I'd always change pages and wonder what happened to the question I asked. Maybe the same thing happened to you!
It should be where all your other questions are. Look to the right of the screen, where it has the options for questions, answers, etc. And click on questions. It'll be there unless it was removed. If it was removed chances are you'll see the title, it'll be a darker color background but you can't click on it.