The only way to know for sure if you have an STI is to get tested.  Many STIs don’t cause any symptoms that you would notice, and you can get an STI from having sex with someone who has no symptoms. If you have had unprotected intercourse and you have any of the symptoms listed, you should visit with your healthcare provider: Unusual discharge from the vagina or penis Pain or burning while urinating Pain during intercourse (for women) Blistery sores Warts on genitals It’s important for both women and men to get tested regularly. Use a condom every time you have sex – even if you or your sexual partner is using other contraception, like the pill, IUD, injections, or implant.