If a pregnant woman was exposed to a chemical that blocked estrogen and progesterone receptors, why should she be worried?
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I think it is progesterone which disables the menstrual cycle and increases blood flow to the uterine lining. The cycle has to be terminated during pregnancy or a miscarriage will occur. The receptors are the places on body cells where the hormone is detected. If the receptors are blocked, the hormone will not be detected.