[USA] [CA/CO] How can I protect myself before being fired as a misclassified contractor?

Hi,

Couldn't find a good place to post this. Hope it's ok here.

I am working a job where I have discovered I am misclassified as a contractor.

They are (probably) about to fire me - I requested switching over to a W2 and they responded with a curt email and a request for a quick call tomorrow.

I strongly believe they are going to terminate my contract.

I am in CO, but the contract says the laws of CA will apply.

How can I protect myself before and after this call, especially since I am considering reporting them to the IRS?

Thank you