Scenario: You had sex and now you're feeling itchy down there/having discharge/painful urination. You know your vagina, and she's just not acting like herself.
Animal Advice: Don't assume the worst.
Action: Step away from WebMD right now! Attempted self-diagnosis will only send you into a more acute panic spiral. If you don't have symptoms that match up with these STIs, there's a very good chance that you have a yeast infection or a UTI. These are both very treatable conditions. There are over-the-counter treatments for a yeast infection that you can get started on right away. But first, off to the doctor or clinic to get an actual diagnosis.