You should quarantine at home and away from other people for 10 days after your last contact with a person who has COVID-19. Quarantine can end after day 5 with a negative COVID-19 test. The test should be performed on the last day of quarantine.
The date of your exposure is considered day 0. Individuals with ongoing contact, such as people living with household members who are COVID-19 positive are exposed every day until that person is cleared from isolation. Every day you are exposed, you must restart at 0.