the invention relates to a corresponding system, method and computer program for non-intrusively determining a fertile window. in particular, it refers to a system to be worn close to the body, as integrated into a bra, to support the personalized forecast of the fertile window for the purpose of planned maternity. the system (1) comprises a contact sensor unit (10) to provide a signal in contact with the woman, the signal being indicative of the woman's breathing, and a processing unit (20) to process the signal to obtain a biomechanical parameter indicative of respiration, and the processing unit (20) is configured to determine the woman's fertile window based on a change in the obtained biomechanical parameter. the system (1) enables a reliable non-intrusive determination of a woman's fertile window.
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