Microbiome and Endometrial Receptivity in Obese Infertile Women

The main objective of our study is to compare the composition of the endometrial microbiota between patients with normal weight and patients with obesity. A. Secondary Objectives/research questions * To analyze the composition of the digestive microbiota through samples of saliva and feces in infertile patients with normal weight and obesity. * To assess whether there is a relationship between the body mass index (normal weight, obesity Class I, Class II, Class III) and the main bacterial species detected in endometrial fluid samples from infertile patients. * To evaluate the influence of the digestive microbiota on the composition of the endometrial microbiota according to the body mass index in infertile patients. * To evaluate if there is an influence of the endometrial microbiota on the results of endometrial receptivity analyzed with the non-invasive Endometrial Receptivity Array test (niERA)