Sex = Period change?

Beks
So I had sex (with a condom) on the 16th and <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>. said that my period was suppose to come on the 17th and it still hasn't came is this normal? I don't usually get it this early but I just really need some opinions I don't believe I'm pregnant because my boyfriend has never came in me