This study will test the feasibility of an EMR alert for progesterone, which provides the opportunity for researchers and care providers to implement and advance the use of proven medical practices in preventing preterm birth and decreasing associated risks of death, life-long disability, family stress, health care use, and lost economic potential. The EMR alert would be transferable to other institutions or regions of the province, and is low-cost, sustainable, embeddable and scalable in the current system health system.