If i was in contact with someone on friday and they tested possitive on monday(today is thuesday) for covid when should i go for testing ? and if i was in contact with my family over the weekend when should they go for testing ?

5-7 days: The optimal testing if showing no symptoms is 5-7 days after last exposure. You need to self isolate during this time. If any of you develops symptoms, you should test at days 4-6 after first symptom. Testing before this time frame may result in false negatives.

COVID 19: Agree w Dr. Kratzberg. It would be optimum to test 5 to 7 days after your exposure. Guidance about people testing who have been in contact with one who is asymptomatic but has been exposed to virus - differs in different parts of the world. Where I live (USA) if I were to develop symptoms, or to become COVID positive, people who had been in close contact should test in 5 to 7 days after being w me