The short story is that all pregnancy tests are checking for a pregnancy hormone called Human chorionic gonadotropin (HCG).
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They also said states could regulate abortion procedures in the interest of a woman's health or in protecting a potential human life starting at the end of the pregnancy's first trimester.
CNN: Before and after Roe v. Wade
It follows the lives of individuals at the key stages in the human life cycle: birth, childhood, adolescence, pregnancy, adulthood, old age and death.
BBC: Fantastic journey through the seven ages of man
HCG, human chorionic gonadotropin, is a hormone produced by the placenta during pregnancy.
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For much of human history, a woman's reproductive life was dominated by pregnancy and breast-feeding, both of which block menstruation.
ECONOMIST: Controlling menstruation
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