Depression during pregnancy represents a relatively underexplored public health issue manifesting in 10-13% of pregnant women, with untreated cases potentially yielding various negative consequences for the mother, child, family, and society. The etiology of pregnancy-related depression remains incompletely elucidated. The metacognitive theory of rumination and depression posits a pivotal role of rumination in the genesis of depression. Rumination involves persistent negative thinking (Papageorgiou and Wells, 2004), while metacognition encompasses beliefs and evaluations of one's own thinking as well as the capacity to regulate cognition (Papageorgiou and Wells, 2001a). According to this theory, positive metacognitive beliefs about rumination trigger its activation. Once activated, rumination becomes deleterious, with depressive symptoms intensifying through the activation of negative metacognitive beliefs about rumination. Given the promising theoretical and practical implications of this model, though limited in its application to the pregnant population, the aim of this research was to examine the metacognitive model of rumination and depression among pregnant women. The study was conducted online with a sample of pregnant women in their second trimester (N=200). Participants completed the Edinburgh Postnatal Depression Scale, the Rumination Scale - Short Form, the Positive Beliefs about Rumination Scale, the Negative Beliefs about Rumination Scale, as well as a general information questionnaire constructed for the research purposes. Findings from the study suggest that rumination is a statistically significant predictor of depressive symptoms during pregnancy. Metacognitive beliefs about rumination (both positive and the two components of negative) did not emerge as significant predictors of depressive symptoms during pregnancy. However, rumination and negative beliefs acted as partial serial mediators between positive beliefs about rumination and depression. Therefore, the metacognitive model of rumination and depression was partially confirmed within the cohort of pregnant women, with its significance extending to practical implications for enhancing psychotherapeutic work focusing on the metacognitive processes underlying onset and development of depressiveness.