Introduction: Pregnancy in adolescence is a problem of alarming dimensions that demands comprehensive multisectoral care. The incidence of pregnancy in adolescents has grown and no previous studies on the entity were found. Objective: To describe the behavior of adolescent pregnancy in the Mantilla health area. Method: Observational, descriptive, cross-sectional study of a universe of 82 pregnant adolescents from the Mantilla health area from April 2019 to November 2020. A survey and test of perception of family functioning were applied, which were processed using Descriptive Statistics techniques. Results: 57.3% of the pregnant women were between 17 and 19 years old, 53.7% had not completed the pre-university or intermediate technical level and 75.6% did not wish to interrupt their pregnancy. Conclusions: Pregnancies in adolescence are unplanned and therefore unwanted; the vast majority of adolescents admit that they are incapable of facing pregnancy and what it means for their later life.