Have just been advised that someone who visited me two days ago was exposed to a co-worker who has tested positive for covid-19. what action should i take?

Observe for symptoms: A contact of a contact is not considered to be at risk,but should still watch for symptoms of COVID-19:fever,cough,feeling tired,shortness of breath,muscle aches,headache,sore throat,chills,chest pain,nasal congestion,loss of taste or smell,nausea,vomiting, diarrhea. Get urgent care for difficulty breathing, blue lips, persistent chest pain/pressure. If the person who visited you is +, get tested.