Diagnostic and Prognostic Markers of Endometriosis in Menstrual Blood

The goal of this observational study is to identify diagnostic and prognostic biomarkers for endometriosis using menstrual blood, an easily accessible yet overlooked biological fluid in women of reproductive age, affected or not by endometriosis The main questions it aims to answer are: * are there relevant differences in the menstrual blood of women affected by endometriosis compared to women without endometriosis? * do some of these differences disappear or lessen when the disease is treated by surgery? Participants will answer questions relevant to endometriosis and provide menstrual blood 1 to 3 times (self-collected with a menstrual cup). A subgroup of participants affected by endometriosis that will undergo surgery for their regular care will provide menstrual blood before and after their surgery. Researchers will compare the menstrual blood of women with and without endometriosis, and before and after surgery to see if they can identify significant differences.