Sorry not the yoke part but the clear part of the egg!
I am just now 37 weeks and started to lose mine last week and it kinda looks like egg yoke it can be clear or yellow or even have blood in it you can also Google it and it will show you pictures its gross looking but helps you can let your doctor know if you would like but they probably will not be concerned at all since you can lose it early and from what I have read before it can even come back weird I know not sure how true that is but anyways you would still have a few weeks yet losing your mp doesn't really mean you will go tonight or even tomorrow so try not to worry to much good luck!