I had sex with a unknown girl with protection but while doing the condom had busted and pumped my penis into her vagina only once then I get to know that the condom had busted. I don't know the status of that girl but I didn't find any symptoms of hiv in her but still I am worrying if in a case she has hiv is it leads to me to get HIV from her. I am really worrying about this it happened before 24 hours. If in a case she has hiv What should I do now to prevent i`t please advise me.