Hello! I have been through your question. You should know that many people with HIV have no symptoms for several years, others may develop symptoms similar to flu, usually two to six weeks after catching the HIV. Related your concern, and based on your data, having unprotected sex few days ago, the good news for the moment is that I think is more possible to have these symptoms for other reasons (viral or bacterial), and not the primary HIV infection, even they are similars. But just in case to be sure for this, because a higher risk exist after an unprotected sex, I suggest to talk with an Infection Diseases specialist, do a physical examination and to see in detail your symptoms ( like how many , tender and bigger are your lymph nodes, their locations) and , full blood count and to do a rapid test or Elisa for HIV ( after three weeks of your last unprotected sex, and as well after three months to exclude better the HIV infection). Also you should be aware that after infection with HIV, it can take up from three weeks to three months for the virus to show up in testing and re- testing may be necessary. I hope my answer help you. I wish you a quick recovery.