Hi, I had unprotected sex 18 days ago. At 10 days after exposure I saw my doctor and got tested for all sti,s including hiv. The doctor also took a swab of my penis to also check as well as the blood and urine test. Spoke with the doctor and all came back negative. However yesterday evening I noticed a small white pimple/blister on my penis. Could this be herpes? Even though I have been tested both by swab and blood? Also what are my chances for hiv? I haven t had any symptoms yet but going crazy about the thought