Freya - Having never experienced it myself, I agree with you - I just don't know how it couldn't have crossed someone's mind or there was nothing that happened to make them suspect.

I was told of a girl I played sport against who played that day and ended up in hospital with stomach cramps that night and had a baby. She was quite young - perhaps just finishing or out of high school, so I always wondered whether it was more 'denial' than not knowing....