Am I owed wages for the duration of my 90-day probationary period when I was let go after a month?

I left an existing job to take a new job with another company. Although there was no employment contract, I was told that my employment was subject to a 90-day probationary period. My supervisor was very difficult to work with, and I contacted HR about this. Three days after contacting HR, I was fired - only a month into my employment. The cause cited was "poor performance".

In repeated meetings with my supervisor, he would threaten me by saying "after this 90-day probationary period, we may choose to not keep you here". That's why I was so taken back when I was fired after only 30-days on the job (which I'm sure was a result of my contacting HR).

Curious if I have a legitimate complaint here. I know Florida is a right to work state, and the employment was "at will", but it seemed to me that there was an expressed contract of a 90-day probationary period to evaluate my performance.