Inclusion Criteria:  Patient monitored for a single pregnancy in consultation or hospitalized in the department of Gynecology-Obstetrics at Nîmes University Hospital. Patient has given written informed consent. Patient has signed the consent form. Patient is covered by a health insurance scheme. Patient is aged over 18.  Exclusion Criteria:  Multiple pregnancy. Patient is taking part in a category 1 research study. Patient is in a period of exclusion determined by another study. Patient is under legal protection or curatorship. Patient is in no condition to express her consent. Patient for whom it is impossible to give clear information.