Hey Sunny - as JM said its often really difficult to identify a reason for IC. There are definite 'culprits', but in most women much of the time there is no prior trauma or congenital issue and their IC simply comes out of the blue, which is why it is such a devastating complication.
I am saddened to see most IC ladies experiencing at least one, if not two second trimester losses before it is diagnosed partly because it goes unnoticed with no obvious cause, and because so many medics still refuse to acknowledge it as a diagnosis until two or more babies have been lost
That is an appalling statistic which has to change!
Sorry I can't be any more specific honey. I know how much you probably need to understand the reasons for your preemie experience, and long to avoid it in the future. Rest assured that you can certainly now take action early in any potential future pregnancies, and that the stitch placed early has excellent almost flawless results. Lots of love xxx