Ok I Had Put My Self Into Low Risk 2

Ok I had put my self into low risk 2 years ago anyway I used a condom with high risk person I hope u can estimate it I took 4 hiv ab test 3 with Elisa and one torch test all returned negative but since I live in a country from 3rd world I called the unaids in my country they are what we say helping from the UNICEF and told him the whole situation and they told me since the tests are negative and of course after 2 years from the risk you are negative but I am still concerned a bout that I can not put my mind to ease I am asking a bout the test kids too are they reliable kits like icare test or std tests kit I will order some of them can u help me plz I have no one to contact