ambigious after being tested negative 4 times after exposure

HI DOC.MY NAME IS RICKY. I HAD PROTECTED SEX WITH SEX WORKER'S IN THE MONTH OF JAN 2007 AND MAY 2007. WELL AFTER THAT  I GOT TESTED MYSELF WITH ELISA FOR ANTIBODIES I AND II . HIV I AND HIV II. THE TEST WAS NEGATIVE, HOWEVER IT WAS IN A 4 WEEK WINDOW PERIOD. SO I GOT TESTED MY SELF AGAIN WITH SAME TEST IN THE MONTH OF OCTOBER 2007 WINDOW PERIOD BEING MORE THAN 12 WEEKS. RESULT. HIV NEGATIVE.  AND I DID IT AGAIN READING SOME ARTICLE THAT WINDOW PERIOD COULD BE MORE THAN 12 WEEKS RECENTLY IN FEB 2008 AND TEST WAS STILL NEGATIVE (WINDOW PERIOD BEING 6 MONTHS). SO DO I  NEED TO WORRY ABOUT SOMETHING? OR FORGET  ABOUT ALL THESE AND MOVE ON WITH LIFE.

KINDLY ANSWER MY QUESTION.

[Teak]

You don't have HIV and you don't need further testing.