progesterone drug ("the pill")
progesterone drug ("the pill")
rhythm method or calendar rhythm <=> regulates conception on the basis of the monthly regularity of the woman's cycle
progesterone drug ("the pill")
progesterone drug ("the pill") <=> prevents conception by preventing ovulation
progesterone drug ("the pill")
contraception <=> performance of sexual intercourse with the deliberate intention of rendering infertile an act which could be fertile