By CDC’s definition, members of the same household, including roommates in a dorm, are considered a close contact of a known COVID-19 positive person, even if wearing masks. You should contact your local medical provider and arrange for a COVID-19 test. You should immediately quarantine yourself at home for 14 days and stay in quarantine, even if your test results come back negative. Once you were exposed or deemed a close contact to a COVID-19 positive person, you cannot come out of quarantine for 14 days even with a negative test. If the test is positive, you must move to isolation at home for 10 days from the date of the test unless you develop symptoms. If you developed symptoms of COVID-19, then you must stay in isolation for 10 days from the date of your first symptoms. You can end your isolation when you have been fever-free for 24 hours and your symptoms are improving.