Fascinating medical discovery: fetal cells remain in the mother's body for years, sometimes decades! Though not scientifically verified, an even more fascinating medical thesis: it's possible those fetal cells may serve to protect the mother from disease and who knows what else.
You can add that to the list of reasons why contraception is way overrated.
And you can add that to the list of biological metaphors for the theological relationship between Christ and his Mother and the Church.
