Negative PCR test does not absolutely rule out Covid-19 infection. With the history of exposure along with your symptoms, you are likely infected but your symptoms have resolved so you are safe. If it's already 10 days since the first symptom, you are no longer a host. If you really want to know if you are infected or not, you can have blood test next month checked for natural immunity related Ab.
Answered 2/20/2022
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Time will tell. I assumed your brother self isolated and wore a mask and you did same. And hope you were vaccinated. Clearly keeps folks from dying of COVID-19. Keep us posted.
Answered 2/20/2022
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