<prompt> AG2P1 to female has a history of previous preterm birth at 32 weeks. The percentage chances of preterm birth in this pregnancy are:1551025  <response>: Preterm labour is defined as spontaneous expulsion of the products of conception after viability and before 37 completed weeks.Prior preterm birth is a very good predictor of subsequent preterm labour. There is a three-fold increase in risk for these women 