I had 2nd had contact with a covid + positive person. what should i do ?

That depends: How close was the contact? Less than 6 feet apart? Both wearing mask? Person appear ill at the time? Outdoors or in a poorly ventilated, crowded tight space? Less than ten minutes? Even if you have the “right” answers to these questions, if someone who is infected coughs or sneezes right at you, you can become infected. Would quarantine. Being tested is the only way to know for sure.