Symptoms...

*fever
*headache
*pain in the limbs
*sore throat
*swollen lymph nodes
*fatigue
*loss of appetite
*diarrhea
*skin rash
Those early HIV symptoms occur within the first weeks after the infection with HIV took place. In this stage though the HIV antibody test is ineffective because the infected person's immune system hasn't developed any antibodies to the virus yet. It usually takes about 3 months until antibodies are detectable.

If you have these symptoms and yours sexually active or share needles you should go get tested ASAP.
of course these could be the symptoms of something else but its safer to know your status.