But at this point, frankly, I would put nothing past the realm of possibility.
"I don't think she artificially conceived"
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Let's review. This was a very promiscuous woman - what is surprising is that for 20 years she carried no other pregnancy to term and was married only twice.
Since her life was an open book - seems to me the matter of abortions and miscarriages would have been discussed somewhere during the past 6 months. vis-a-vis how much she wanted or did not want another child.