Hi,
You may develop a brief flu-like illness two to six weeks after becoming infected. Signs and symptoms of an initial infection may include fever, headache, sore throat, swollen lymph glands and rash .
HIV tests aren't accurate immediately after infection because it takes time for your body to develop these antibodies, usually about 12 weeks. In rare cases, it can take up to six months for an HIV test to become positive.
http://www.mayoclinic.com/health/hiv-aids/DS00005/DSECTION=2
http://www.mayoclinic.com/health/hiv-aids/DS00005/DSECTION=6
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