Hi, I was tested for HIV on April 2015, it was negative, since then I have had sex with four different partners, with the first two I had protected vaginal sex only, no oral or anal. with the third at first he gave me oral sex and then we had vaginal sex, he used a condom most of the time, but all of a sudden he took it off and lasted a few seconds, he didn't come inside (by the way I told him I was worried about std's and he said I shouldn't worry). and with the last I'm having regular sex, we use condoms, sometimes we have oral sex (he never ejaculates in my mouth), but the last time he penetrated me without a condom just for a few seconds then he put one on (I told him too I was worried about std's). I want to know if I am at risk of HIV, thank you.