My current job apparently had a probation period. My manager didn't tell me about it until he's like "It's been 90 days, you've passed!" I thought because I was in a right to work state it really didn't matter if I was in probation or not if they wanted to fire me.
Can anyone explain the probation period in a non-unionized state?
My understanding is that the requirements of firing "for cause" get more stringent after 90 days. Before the 90 days they don't really have to prove that you did something wrong, they can just let you go for no-fault lack-of-fit. After 90 days they have to give a performance-related reason and have backup documentation or risk being sued for wrongful termination. Also, at a lot of places the benefits tend to kick in at 90 days.
I think this is probably wrong. Virtually all of the US operates (thankfully) under at-will employment rules; it is difficult under any circumstances to sue for wrongful termination, and employers are generally free to fire for no reason at all.
The biggest reason I've seen for termination to get tricky involve protected employment classes (race, gender, &c) and the ADA, but those issues apply with equal force during the "probationary period".
You have the same right except it's not limited to the first three months. Approach the person who hired you, explain the reasons you're not happy and offer your resignation.