<unk>  occurs in approximately 0.2–1% of all pregnancies. Though different causes change when<unk>  is most likely to occur, the majority of<unk> s occur before 37 weeks gestation, and 12-14% occur before 32 weeks gestation.
Placental abruption
Chorioamnionitis
Uterine rupture
Placenta praevia
Bloody show
Toxic abortion
Umbilical cord prolapse
Septic abortion