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Although oral contraceptives (OCs) allow women to control their fertility and delay childbearing, women who use the pill often express concerns about their ability to conceive. These investigators analyzed data on OC use before pregnancy from the Avon Longitudinal Study of Parents and Children (a large-scale study of influences on pregnancy outcomes in which 85% of the women who were pregnant in southwestern England were surveyed over a 21-month period [n=14,210 liveborns]). Each woman and her partner completed questionnaires at 18 weeks' gestation regarding previous obstetric and gynecologic history, total duration of OC use, and length of time to achieve subsequent pregnancy. Other factors in the survey were cigarette use, alcohol use, ag…