You ever get the feeling that you've forgotten to do something?
You left home and maybe you didn't lock the door.
You know you showered but maybe you didn't wash your hair.
I do that all the time. One of the things I keep more careful track of is my writing submissions, so imagine my surprise when I emailed an editor to ask what the status of my submission was and she responded with 'eh... oops' (paraphrased).
I submitted in October.