Abstract: A method of contraception and a pharmaceutical package for effecting the method are disclosed. The method comprises a three phase sequence of estrogen/progestogen administration which is a daily sequence of unit dosages over a repeating cycle, which dosage sequence comprises, for one cycle:(a) administering, as phase one, about 20-40 .mu.g of ethinyl estradiol, (or of other estrogen in an amount sufficient to result in an equivalent effect) and about 0.3-0.8 mg of norethindrone (or of other progestogen in an amount sufficient to result in an equivalent effect) each day for 5-8 days, followed by;(b) administering, as phase two, the same dosage of estrogen and twice the dosage of progestogen each day as was administered each day in phase one, for 7-11 days, followed by;(c) administering, as phase three, the same dosage of estrogen and the same dosage of progestogen each day as was administered each day in phase one, for 3-7 days, followed by;(d) administering, as phase four, no therapeutically active dosage, i.