Will I get fined?

I hired a worker while forgoing to check their right to work documentation because the law changed after brexit. she gave me her application for right to work and I thought its enough but it wasn't. So my company suspended the worker till gov sends her the right to work documentation.

The problem is she worked 3 weeks before that, which is illegal and there are very hefty penalties for that. I am really worried now.
Will I get fined?
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