Could Positive Make Me Negative

I was in touch with an individual who came back positive with the Corona-Virus which might have led me to be negative. For if I never knew this fact I wouldn’t have self quarantine a matter of fact I would have been very lax instead. Lax to the point that it would have led me to a position where the risk to retaining the virus would have increased exponentially. Therefore I pray that my friend and loved one’s get better and in sense thank them for helping prevent this virus from entering our lives as well.