The increasing demand for female-centred services and devices in the digital era has challenged traditional notions of privacy. This thesis explores how users perceive privacy issues in period- tracking applications provided by various developers. By utilising mixed-method research and adopting an ethnographic methodology within the framework of Actor-Network Theory, this study examines the trade-off of sensitive data in exchange for predictions through agential roles in the use of period-tracking applications. The results reveal that users desire control over whom they share their menstrual information with and feel confident doing so with non-human actors, the period-tracking application. Users are unaware of the developers' access to their data and the potential selling of it to third parties. The study highlights the power dynamics between users, period-tracking applications, and developers and their impact on perceived privacy. The research emphasises the mediating role of the period-tracking application in trust and power dynamics as users perceive privacy differently in the digital and physical worlds. The thesis proposes a podcast prototype that demonstrates the impact of technology on user behaviour and their willingness to compromise their privacy. The prototype aims to evokes emotions and encourages reflection on how non-human actors can influence decision-making. The podcast prototype emphasises user's need for more awareness of how data is used and highlights the potential dystopian future. Through this demonstration, the thesis aims to contribute to a deeper understanding of the complex interplay between human and non-human actors in the digital world and their effect on individual privacy.