Life vs. Time/Body vs. Mind (abortion)

Women kill their eggs every month because the time was not right um I mean their body understood that BUT that is ok because the body did it Women that have a miscarriage are innocent because their body judged that it was a hostile environment for the child to grow in meaning the time was not right If the woman decides that the life she will provide to her child outside her womb will be in a hostile environment because the time is not right why can't she decide herself what to do? If the body of the child because of a extreme disease will be itself a hostile environment to exist in why can't the woman decide that the time is not right for her child to come out in this world?