PurposeThe aim of the study was to create and to validate the Polish version of the original English version of the Pandemic-Related Pregnancy Stress Scale (PREPS) developed by Preis and colleagues (2020a; 2020b) We additionally investigated the association of maternal obstetrical and pandemic related factors with the PREPS in order to test its sensitivity. MethodsA cross-sectional study design with nonrandom sampling was used. The sample consisted of a total of 1148 pregnant women in various trimesters. They were recruited via social media and completed an online study questionnaire in April-May 2020. ResultsThe results of the present research indicate satisfactory psychometric properties of the Polish version of the PREPS. Our findings confirm the factor structure found by the authors of the original English version of the PREPS. The scale consists of two stress subscales: perinatal infection stress and preparedness stress and one additional positive appraisal scale. Pandemic-related pregnancy stress is significantly associated with fear of childbirth and with non-pandemic pregnancy-specific stress, which bolsters its convergent validity. Higher levels of pandemic-related pregnancy stress are experienced by primiparas, those in their second or third trimester, women who received infertility treatment, and those with a high-risk pregnancy. ConclusionsThe Polish version of the PREPS has sound psychometric properties and replicates the structure of the original English PREPS. This stress scale can be used to investigate additional impacts of the COVID-19 pandemic and to identify women at risk of high stress and those who need intervention.