Hello, and I hope I can help you today. Vaginal discharge during late pregnancy increases and turns more like yellow mucus as your cervix starts to soften. This is caused by hormonal changes and has nothing to do with labor. This is not necessarily your mucous plug as that usually produces some bleeding as well is discharge. So as long as you did not experience vaginally bleeding, this mucus may not have anything to do with your body getting ready for labor. If you start to experience any regular, painful contractions, or have any vaginally bleeding, or leakage of clear to white watery fluid that drips from the vagina, you should call your doctor or midwife as these may be signs of labor. I hope that I was able to adequately answer your question today, and that my advice was reassuring. Best wishes for the rest of the pregnancy and delivery, Dr. Brown