From the Chicago Department of Public Health:
If you are sick, you must stay home (except to get medical care) for 10 days since your symptoms first appeared, and at least 24 hours with no fever and improved symptoms (whichever is longer). Stay away from others and isolate in a separate room, if possible. Always wear a face covering when you need to be around others, even when you’re at home.
The CDC recommends layering your masks to increase you protection. Visit the link above to learn how to make masks fit more snugly, layer your masks, and what you should avoid.
If a household member is sick, all members should also stay home and self-quarantine for 14 days. Consider having everyone in your home wear a face covering as soon as someone becomes sick. Check your temperature twice a day and watch for symptoms of COVID-19. Get tested 5-9 days after being in contact with the sick person.
Separate a household member who is sick:
How to protect children and high-risk family members: