I had exactly the same thing a few weeks ago. I remembered I accidentally made a stain in my shirt and I remembered how I did it and that I knew after it happened that I knew it happened, but then the next morning there was no stain or anything. Maybe you should see a psychologist if you’re worried about having schizophrenia. Than you atleast know if you have it or not and you don’t have to worry so much about whether you have it or not.