Opposite effects...: Combination Oral contraceptive pills contain Estrogen and Progesterone. These are synthetic versions of hormones that also occur naturally in a woman's body. They prevent conception mostly by preventing ovulation. RU-486 is an ANTI-progesterone. It prevents progesterone from supporting the uterine lining and pregnancy and this results in a miscarriage. Best wishes!
Answered 12/18/2016
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