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No. ECPs can be used at any time during the menstrual cycle. If the client is concerned about the risk of pregnancy, she should receive ECPs regardless of the timing. This is especially true if the client has been using oral contraceptives (OCs).
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It is difficult to know when ovulation occurs in a given cycle, particularly for women with irregular cycles. The risk of conception is highest between six days before and one day after ovulation.
- Webb A. Emergency contraception. Fertility Control Reviews 1995;4:2:3-7.
- Wilcox AJ, Weinberg CR, Baird DD. Timing of sexual intercourse in relation to ovulation. New England Journal of Medicine 1995;333:1517-21.
COC users do not have a "menstrual cycle" but withdrawal bleeding; missed OCs can permit follicular development which can lead to ovulation.
- Landgren BM, Emiczky CS. The effect on follicular growth and luteal function of "missing the pill."Contraception 1991;43(2):149-59.
- Killick SR, Bancroft K, Oelbaums MJ, Elstein M. Extending the duration of the pill-free interval during combined oral contraception. Advances in Contraception 1990;6:33-40.
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