Everyone loses their mucus plug it's just wether they see it or not. It can come out as a whole plug (looks like a tampon in size) or as discharge, normally blood in the discharge or plug is a good sign. You might not lose your plug until just before bubs is born, everyones different, I'm sure if you come across it you'll know! Both times my plug has been clumps of mucus with blood init!
Hope this helps,
Snoopea