What are some signs you should checked for an infection?

I know some and that they're listed on search sites like Google but I want to know from my fellow <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>-babies! Just to hear how you guys first knew. what if you don't have any symptoms? What's your story on having one for the first time?