If it didn't have blood it doesn't mean labor is starting soon. You can lose plug for weeks but if it's bloody that's when labor is close. Hang in there!
The plug doesn't always have blood in it. It can be clear, yellow, pink, or even green. It can be days or weeks before labour though...good luck!
For my first it was weeks before I actually went into labor after I lost it. This time I'm 38 weeks and lost my mucus plug 3 days ago. Went today and asked her to check me and I'm still only dilated at 1.