yes,sorry to say but it is possible.

I,ve never been tested, I,m not on any medication, what would the symptoms be.

obviously go get tested at a sexual health clinic...its a good thing to do every year anyhow by default and use protection in the future! the clinic can answer all your questions ..also in the uk theres a free sexual health tel hotline and you can ask as many questions as you like...google it for the tel number...free sexual helpline..rather than worry over it go telephone and go to the clinic to seek professional answers to your questions...anyone not using a condom puts themselves at risk.

This site will tell you all the HIV/AIDS symptoms. Check it out and go get tested.Its always best to know your status so you can take the proper steps to insure your good health.
http://www.patientslikeme.com/hiv/symptoms

put in google - symptoms of hiv aids?
and go get tested like hellooo obviously!
everyone should have a sexual health checkup once a year including a hiv test...you need to go to ask questions from professionals as per my last message here...you are asking the community but professionals are who you should ask professional advice from...if youre that concerned go get tested its not rocket science. good luck.