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Introduction: Pregnant teenagers are at a higher risk of physical and psychosocial health issues, and although most pregnancies are unplanned, few studies delve into the process behind their decision to continue the pregnancy. Objective: This study aims to identify the determinants of the pregnancy experience for teenagers and to understand the decision-making process regarding the continuation of pregnancy from the perspective of teenage girls. Results: Key elements of the decision-making process include giving meaning to the pregnancy and anticipating the reactions of others upon announcing this decision. The pregnancy experience is linked to the support available to the mother and a rapid transition into adulthood. Discussion: The experience of being pregnant during adolescence is a passage into a new reality that involves several difficulties and fears. The decision to maintain the pregnancy is made in solitude. The appropriation of pregnancy during the decision-making process appears to influence the degree to which teenagers seek out information, ask for support, and adopt health-conscious behaviors.