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Based on social cognitive theory, this study explored women\u2019s purposes for using period-tracking apps and the personal and environmental factors that influence frequency of use related to (a) menstruation, (b) pregnancy, (c) sexual activity, and (d) information management. Our cross-sectional survey of 249 women living in the United States of America who reported using a period-tracking app in the last 12 months showed that that older age, likelihood\/risk of unintended pregnancy, pregnancy anxiety, and living in a state with an abortion ban predicted greater frequency of app use for pregnancy-related tracking purposes, while education level, likelihood of unintended pregnancy, and sexual\/reproductive health history predicted tracking purposes related to sexual activity. 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