Fucked up big time at Work!

I sent an email to 2 clients giving them a quote for something, in the trail of the same email chain you can see the working of our company's margin and everything. It was caught by my boss/owner of the company after 3 days. Don't know how I'm gonna face them. Might be getting fired although I'm okay with that just not ready with everything that's gonna come it. Listening to kendrick lamar's sing about me, I'm dying of thirst on the train currently to cope