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RE: Pregnancy Brain: Pregnancy May Lead To Long Lasting Changes in Brain Structure
it could be impossible to know for sure if a womans had a miscarriage, if she's never knowingly been pregnant. could be a hard thing to study. So women wo didnt actually become mothers were used in this one? it's confusing!
Yes they used the first trimester as cut off. You can't really have a miscarriage after that without knowing is perhaps the reasoning.