Final answer:
An involuntary urge to push is most likely a sign of transition to active labor, which occurs toward the late stages of pregnancy. Contractions serve to dilate the cervix and expel the newborn.
Step-by-step explanation:
An involuntary urge to push is most likely a sign of transition to active labor. Toward the late stages of pregnancy, a drop in progesterone and stretching forces from the fetus lead to increasing uterine irritability and prompt labor. Contractions serve to dilate the cervix and expel the newborn. Delivery of the placenta and associated fetal membranes follows