history: I made a big mistake on a project for work. Now I'm afraid that it will hurt my career. I'm so ashamed of myself. I made a big mistake on a project for work. What did you mess up? It was something for an important client. Now I'm afraid this is going to screw up my career. I'm sure you'll be fine.  Have you made many similar mistakes in the past?
current: No, this is the first time I've messed up anything like this.
next: I wouldn't worry too much about it then.  Don't let it get you down.