Background: Increasing knowledge and attitudes towards pregnancy preparation is one of the earliest possible efforts to produce a healthy pregnancy. This study aims to identify behavioral tendencies regarding pregnancy preparation in adolescents by applying the Health Belief Model. Methods: A total of 300 adolescents in Metro City participated in an experimental study on the use of health promotion application media. Identification of behavioral tendencies regarding pregnancy preparation is explained using hierarchical regression on knowledge, attitudes, peers, access to information, and perception constructs in the Health Belief Model.