Volume 10, Issue 4 Bleeding data: the case of fertility and menstruation tracking apps Anastasia Siapka, KU LeuvenElisabetta Biasin, KU Leuven PUBLISHED ON: 7 Dec 2021 DOI: 10.14763/2021.4.1599 Apps to help track fertility and menstruation proliferate, and so does the commodification of user data. How is this tendency viewed in light of the GDPR and the UCPD? KEYWORDS: Data privacy, Fertility tracking, Consumer protection, Mobile apps