What should I do if I was around my friend who now has covid?

I was hanging out with my friend a couple days ago. He just told me he has covid. He said he wasn't feeling well last night or today. I have an at home test I was gonna take in the morning. If it comes up negative can I just go about my life or do I have to quarantine?
What should I do if I was around my friend who now has covid?
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