Bea, you can delete a post if that happens. Just go to the one you want to delete, and click the edit button, then look for the little box that asks if you want to delete the post. Check it and poof that post is gone.

Also another idea if you have to edit a few times, is when you are editing to remove the previous "edit" notations on the bottom. Or you can push your pages back to your original post, make the changes there, submit again and then delete the original post which will still be there.