Fertility and pregnancy during teenager period is associated with increased risk of maternal mortality and morbidity, premature termination of education and high rate of population growth. When teenagers become pregnant they are less likely to use antenatal and delivery care from health workers. The goal of the study is to investigate the determinants of teenage pregnancy and assess the pattern of use of antenatal care service utilization of women in Assosa Woreda. The information of this study was obtained from well designed questionnaire, focus group discussion and key informants. Women age groups 15-19 was used for teenage fertility assessment and women who have given birth at least once in age less than 20 years was used for assessment of maternal health service utilization.

Keywords : Teenage pregnancy, Attending Antenatal care, Logistic Regression, Chi-square.