Could labor be coming soon?

I'm 37 weeks and dilated at a 4.5 and have been for weeks. My doctor says not to expect a mucous plug or bloody show as an indicator of labor and that I should just time my contractions. I've had this randsom discharge today its white and kind of snotty and slimy but doesnt stink. Could this mean labor is coming soon I've never had this type of discharge before