An unobtrusive system (100) is designed to provide personalized and real-time information about a womans menstrual cycle and the different phases thereof. The system (100) comprises an image detecting unit (10) that is arranged and configured to detect an image of at least a portion of a womans face (101) and to output a detection signal representative of the image a processing unit (20) that is arranged and configured to receive the detection signal from the image detecting unit (10) and to process the detection signal according to a preset routine in order to generate an information signal representative of information relating to the subjects menstrual phase and a communication unit (31, 32) that is configured to generate output comprising the information relating to the subjects menstrual phase in a humanly processable form on the basis of the information signal.
