I had sex with a unknown person. She had sex with another guy before 5 mins. After that she gave hand job to arouse my penis and i she wore the condom on my penis. I used 2 condoms and she gave hand job and blowjob with condom. I never had anal or vaginal sex.I am not sure she washed her hands before stating to have sex with me. Is there a possibility that i may be infected with HIV ?. Its been only 2 days. I had sex with her after 5-10 mins the guy before me finished. I am very much feared. Kindly help me. Should i visit a hospital now itself ?. After how long can i test it ?

I have took HIV duo ELFA test which involves HIV antibody test for HIV 1,2 and p24 antigen test after 21 days of exposure. I had joint pain all over my body when i took the test. Both results came negative. I still have body pain all over my body. Should i be worried anymore ? Should i take retest again after 3 months ? Will body pain alone attribute to hiv infection after 2-4 weeks.I have no other symptoms. If the body pain is due to HIV, will the test would have shown it ??. Kindly help me. I am very much stressed and confused.