I had sex with a guy i just met a couple of times before we did it. Honestly we never discussed about our past sexual history. He was inside me for 15-20 minutes and and then he wore condom just before he came(he did ejaculate inside me but with a condom on). I started feeling sick 3-4 days after sex. I got flu-like symptoms, rash, tiredness. I am scared if these are HIV symptoms.what is the percentage i am at risk ?