She had O.I. To someone who has had great difficulty with pregnancies it is not a definite answer but a definite possibility. When you think about it, it makes since. When my bp drops, then my body cuts off blood supply to what it deams as unnecessary parts of the body........digestion, etc and if the blood flow is cut of to the baby then that could be life threatening or at least cause complications. mary.........Not saying this is what caused my problems but no doctor has ever been able to offer me any explanations other than "your body has had all it can take and therefore the pre-term labor". mary