Understanding Cycles to Improve Women's Health

Inclusion Criteria: * Woman of childbearing age (18-39 years) * Woman not using hormonal contraception for at least 6 months * Woman with semi-regular menstrual cycles between 21 and 45 days inclusive * Woman with no known history of infertility * Woman working in the same environment (urban/rural) as her place of residence * Knowledge of the dates of periods over the last 3 cycles * Woman who has a freezer at -20°C Exclusion Criteria: * Diagnosis by a physician of one or more of the following comorbidities: Polycystic ovarian syndrome (PCOS), Endometriosis, Adenomyosis, Diabetes or thyroid disease, Hormone-dependent gynecological cancers (breast, endometrium, ovaries), Coagulation diseases (von Willebrand), Chronic liver failure, chronic renal failure, heart disease, autoimmune disease, Autism, Diagnosis and/or treatment for a psychiatric illness * Chronic exposure to cocaine, amphetamine/methamphetamine, morphine or ecstasy within 30 days prior to inclusion * Chronic exposure to THC within 7 days prior to inclusion. * Person who is not comfortable with self-sampling (hematophobia or other) * No access to a smartphone * No possibility of wearing a connected ring for at least 60 days 22h/24h * Pregnant or breastfeeding woman * Woman who gave birth or breastfed in the 2 months before the study * Person who moved less than 2 years before the study (does not concern participants who moved in the same environment (rural or urban, less than 20 km) * Person unable to read French * Failure to obtain informed consent * Person not benefiting from a national health insurance scheme * Person under legal protection, guardianship or curatorship * Person participating in other research involving the human person