I am a contact of a person who had risky contact with an infected person.
Be in preventive quarantine for at least 5 days, monitor your health. However, you do not have a legal right to self-quarantine, so try to arrange an agreement with your employer, so you can work from isolation. If you find out that your contact has no symptoms after 5 days, you can end the quarantine, otherwise, stay in it for 10 days. If your contact was positive, you become a direct contact.
Risky contact is a contact in enclosed spaces, at a distance shorter than 2 meters when neither side was wearing a face mask.