If you are worried you have an STD because you are experiencing pelvic pain, a sore in the genital area or vaginal discharge or odor then you need to see a health care provider to have a full STD screen. Most of the time you are worried you already have an idea you may have had an exposure because there are trust issues with your partner and you had unprotected sex.
If you have concerns and you have no symptoms you still need to see your provider. Most STD's do not have symptoms and you could carry the disease and pass it on for quite a while before discovering you have it. Some STD’s have an initial symptom that disappears before you have it checked out and you mistakenly assume there wasn’t a problem.
It is a good idea to ask any new potential partner if they have ever had an STD and when the last time they were checked. Safe sex starts with choosing your partner wisely and then continuing to always carry a condom/ dental dam and protect yourself no matter what your new partner may tell you.