Warning - be careful using "best regards"

Fucked up on Saturday, I usually have a "thank you!" Or a "sincerely" at the end of my signature line, but I sometimes switch it on long chains. Had to come in on the weekends to catch up. I usually like to type "best regards" because it can be done with one hand, but I mistyped and switched the "g" with a "t" on a client email.

I didn't realize until now when I came in today on Monday and managing partner put in a meeting on my calendar for after lunch.

How screwed am I?

Edit : had the meeting, the client is a friend of the partner so they just had a laugh about it and told me to double check on other clients going forward.