Please help

I had unprotected vaginal sex with a street worker 4 weeks ago. I have had neck tension and a headache for the past 8 days. No other symptoms (fever, sore throat, rash, etc) . However the headaches do not seem to go away. Could this be a sign of hiv infection. I know the only way to know for sure is to get tested, I just want to prepare myself for the possibility I am positive. Thank you in advance for any responses.