Did you look at the link? The mucous plug coming away is called a show....a show isn't something else and yeah you can lose it or some of it a fortnight or so before or once you're in labour. With my babies I have sometimes had a show a week before and with my last baby I only lost it as I went into labour.
I'm afraid in this instance you are mistaken....ask your midwife. I'm not meaning to be argumentative but I wouldn't want people to be confused as it really is the same thing.
This link may help further...here's a quote from it........
Signs of labourThe signs of labour can include:
strong, regular contractions,
a 'show' (when the plug of mucus sealing your cervix comes away), and
your waters breaking.
https://www.nhsdirect.nhs.uk/articles/article.aspx?articleId=2320§ionId=10