Your risk for anything is really low, and given that you haven't had symptoms, I wouldn't worry at all.
The only things you'd be at risk for are herpes, syphilis and HPV. There is no test for HPV, but most doctors say that's an inevitable part of being sexually active now since most people (like 90%) will get that in their lifetimes, but without symptoms of syphilis or herpes, I wouldn't worry at all.