Anyone ever used aftera emergency contraceptive ?

Andrea
My period is late 4 days according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>. I'm freaking out my period was suppose to come last Friday but it didn't two days before I was suppose to have my period I got brown light red discharge like you would normally get when my period is ending so what does that mean any help?