Tested and Waiting for Results
If you have been tested for COVID-19 and are waiting for test results you should:
Positive Test Result
For more about isolation: https://www.cdc.gov/coronavirus/2019-ncov/if-you-are-sick/isolation.html
Negative Test Results
You probably were not infected at the time your sample was collected. The test result only means that you did not have COVID-19 at the time of testing.
If you are a close contact of a positive case, you still need to complete your quarantine period.