I had a unprotected vaginal sex with a unprotected vaginal sex with a female sex worker in Jan 8th. I didn't used condom during the whole event. After this, I found that there was a small breakage on my penis.I was so regret. It was so stupid. Am I still exposed to the danger of HIV infection as well as other VD? When can I go to CDC for examin? I hope you guys can advise on what to do next .