As far as im aware, you can take the test multiple times and it'll be for free either if you dont have insurance. If you have to provide your employer with a copy of your test all you have to do is let them know and they will give you the proper steps to make that possible.
I had to go twice with 7 days and my insurance paid it. If you do not have insurance it falls under the Cares Act and is free.
I had 2 on the same week and there was no charge initially. It will be up to insurance whether or not they pay it later
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