I moved this to the employment section, since your question isn't really a criminal defense - related one. As for whether you can get fired, I'm not suggesting I'm an employment law expert, but I'd just note that Wisconsin is an at-will employment state, meaning that you can be terminated without reason except for certain limited circumstances, and unless you have language in your employment contract prohibiting your termination under specific circumstances. If you're having a disciplinary hearing, my advice would be to retain counsel and defend yourself at this hearing with all of the evidence in support of your contention that you didn't do anything worthy of being fired.
If you are a union member, contact your union.
If not, as already indicated, you need to consult an employment attorney.
This answer is provided for general information only. No legal advice can be given without a consult as to the specifics of the case.
Wisconsin law makes it unlawful to discriminate against an employee for their arrest and conviction record. The law differs on suspensions related to arrests and terminations for conviction records. You will want to consult with an employment attorney to go over this in detail as these are complex, fact-specific matters.