There have been times that some woman are unaware that they're pregnant.
I do remember hearing of this a number of years back.
Be that as it may, its same to say that those were a very tiny percent of times when it might happen.
Usually, its always very evident when a woman is pregnant.
How about a bit of sensitivity, in this case, since the media will always try to paint it in a one-sided and sensationalistic light.
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That post before mine is bankrupt of sensitivity.