Good Evening Doctor, I'm A Nigerian And I Had An

Good evening Doctor, I'm a Nigerian and i had an unprotected sex 3 months ago since then I have been suspecting whether I contacted with hiv or not this stimulated me to test myself and the lady we had an incident with but test relieved negative.
I repeated the test after 3 moths one came positive among five tests that i did, Sir I have small rashes on my arm it looks like pimples but I'm not sure and I'm feeling burning sensation