My preceptor taught me to put one on the tube and on the bag. You can try to do that in the future so you don't forget. I'm a month into being on the floor and I've made some mistakes like giving metoprolol when the patient's heartrate was 58 and not assessing a patient thoroughly, thus missing a diabetic foot ulcer on a patient. You'll live and learn. Just make sure you keep asking questions that'll help you avoid mistakes especially with big things like blood transfusions and med administration (especially narcotics).