Does Plan B expire?

Ruthi💋 • Kaliah 10/09/12👱🏽‍♀️, Lavon Jr. 10/28/15 👦🏽, Londyn 11/07/16👧🏽, Khalil 08/22/18👶🏽 🥰The loves of my life🥰
My SO and I had sex this morning and I took Plan B after (Birth control appointment is not until the 10th). I've had this pill a little over a year now. I was just curious as to if it has an expiration date or not.