Final answer:
The statement "I need to have a BM" generally indicates a woman is in the second stage of labor, where the baby's descent can mimic the sensation of needing a bowel movement. This typically signifies that it's nearly time to push.
Step-by-step explanation:
The statement "I need to have a BM" is a hallmark response from a woman that is typically associated with the second stage of labor. This urge is often felt when the baby's head descends into the pelvis and exerts pressure on the rectum, giving the sensation of needing to have a bowel movement. In the context of labor, this sensation signals that the baby is moving down the birth canal and that it may soon be time for the mother to push. To support delivery, if labor stalls before this stage is reached, an intravenous infusion of synthetic oxytocin, known as Pitocin, may be administered to restart and maintain contractions.