The nurse should first note the amount, color as well as the odor of the amniotic fluid.
Explanation
When a patient’s membrane ruptures spontaneously, the nurse should start by checking the consistency, odor, as well as the volume of the amniotic fluid. For this case, there are minimal chances of cord prolapse because the fatal head is already engaged and at 0 station. If the fatal head is not yet engaged, the nurse should start by checking for cord prelapse if the membrane ruptures spontaneously.