This sociological study examines the social pathways that lead from contraceptive practice to abortion in cases of unintended pregnancy. It treats pregnancy not simply as a private event, but as a situation shaped by knowledge, access to contraception, medical advice, personal circumstances, and institutional responses. The work brings together research on contraceptive behavior, reproductive decision-making, and the circumstances surrounding recourse to abortion, with particular attention to how individuals and couples navigate uncertainty, prevention, and care. Intended for researchers, public health professionals, and readers interested in reproductive sociology, the book offers a structured analysis of unintended pregnancies and their social context. It is useful for understanding the relationship between contraception, abortion, and broader questions of health policy, gender, and social inequality in France.