i have posted on here before. i had sex with two women about a year ago that i didn't know. i think they were sex workers. i used a condom both times and the condom didn't break. i'm pretty sure they were latex condoms and i wasn't in the women very long (about 30 to 60 seconds). should i be concerned? i'm very concerned and from reading other posts i see that my chances of getting hiv are pretty slim. any advice or comments would be helpful.