Critical Period: Embryology As is well known, a certain organ arises much earlier or later in the embryo than certain others.
How soon after my mucus plug passes will labor begin? Passing a mucus plug is a sign that your cervix is dilating and that your body is preparing for birth. Labor could be hours, days, or even weeks away as the cervix gradually opens. The mucus plug is usually clear, slightly pink or blood tinged in color. It can be stringy mucus or a sticky discharge.
A mucus discharge means labor is beginning. John Howard/Digital Vision/Getty Images. It's heading toward 63 days after your dog was bred -- the average canine gestation time -- and you're looking for signs of the impending birth. When early labor begins, your dog might pass a small amount of mucus from her vulva. If you see her pass mucus, she should enter the active stage of labor within 6 to 12 hours.