Do all women who had pre term labour with no known cause, a candidate for the progesterone shots? is there any situation where it's not necessary?

Need to know more: This question is best answered by your ob-gyn who knows your gyn history best.

Labor v. delivery: Not all women who experienced pre-term labor need progesterone, only those who had pre-term birth. If the preterm birth was due to condition like placenta previa, pre-eclampsia or other maternal of fetal conditions that warrant delivery, then Progesterone may not help. But that decision should be made by your obstetrician or perinatologist.