Okay, can I get a general consensus of what the prescription looks like for hydroxychloroquine if you're trying to use it as a preventative for covid

I was directly exposed to someone during Christmas Eve and Christmas who today tested positive for covid-19, and I believe it was from a test he took prior to christmas.

I have some 200 mg hydroxychloroquine, vitamin c, vitamin d, and zinc. I'm looking for someone to lead me in the right direction.