I had this.... About 2 weeks before DD arrived. Had a bloody show the day I went into labour. The clear show can come anytime before labour but generally a weeks before. That's what my "what to expect when you're expecting" said... And it was right.
I'm 38+2 and have just had to put a panty-liner in for the first time - quite lot of discharge which is clear or creamy - sorry if tmi. Hoping this means things might get going fairly soonish.... DD1 came at 39 wks exactly and I had a small bloody show the day before.