Hello Doctor, Hope you are doing good! I had protected sex with a sex worker and later I was worried about HIV, so I got tested on first week and fourth week after the exposure. I took HIV 1 and 2 (electrochemiluminescence immunoassay) Serum test and both the time the results came as NON-REACTIVE on first and fourth week. Can you please tell me am I safe from HIV now, I'm really worried about this, please answer me! Thank you.