I had unpprotected sex with an ex boyfriend a few times, about 2 years ago. It was an extremely stupid mistake, but he said he was tested and clean. I've never had any discharge, pain, or anything... But I've read you can have an STD or HIV without having any symptoms for years. I know the only way to know for sure, is to get tested. But to ease my mind a little bit, what are the chances I would have an STD, if I haven't had any symptoms at all, over the past 2 and a half years?