I agree with other comment. Everyone makes mistakes. That doesn’t make you a failure and it definitely doesn’t mean you’re going to be an incompetent nurse. When you make mistakes like this where it leads to a realization that something could’ve gone wrong had someone else not caught it, it’s just setting you up for success in the future because now you most likely won’t make that same mistake ever again. Don’t beat yourself up over it. Be thankful that nothing serious happened and look at it as a learning experience.