I thought I was about to be fired, so I told my boss I was quitting. She said she was actually about to promote me, did I screw up?

Basically what I asked. She was shocked and after she said that (on Friday) she asked why I was thinking she wanted to fire me and why I was so ready to quit. I tried to brush it off and talk about the promotion but she said we'd talk about it on Monday and sent me home.

Updates
+1 y
Update; I did not get the promotion and now my boss said she s thinking of laying me off because I wanted to quit
I thought I was about to be fired, so I told my boss I was quitting. She said she was actually about to promote me, did I screw up?
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