Young women represent a population at risk of psychiatric disorders, the first signs of which often appear between the ages of 15 and 25. Psychiatric disorders are a major source of disability and healthcare costs. The perinatal period is an additional period of psychological vulnerability, during which women are at increased risk of developing or worsening psychiatric disorders. Unfortunately, psychiatric disorders seem to be largely under-diagnosed during this period, and therefore under-treated. The goal of this Prospective multicenter study is to determine the prevalence of the presence of at least one characterized psychiatric disorder, as defined by the use of the Mini International Neuropsychiatric Interview (MINI), in remission or not, during pregnancy, at the time of the second-trimester ultrasound (T2 ultrasound) based on a standardized clinical assessment. Participants will complete self-questionnaires and have a standardized psychiatric evaluation at T2 ultrasound and at 2 months postpartum.