The electrical activity of the uterine muscle, when picked up on the motherís abdomen, is called the Electrohysterogram (EHG). EHG has been proven to be representative of uterine contractility. Its characterization may be used to detect a potential risk of preterm delivery in women, even at an early gestational stage. We have developed specific tools for the recording and the processing of EHG in order to characterize uterine contractility for the early detection of preterm labor (PTL) threat. This tools focused on: studying of the best electrode position, EHG preprocessing (denoising, segmentation of EHG bursts related to uterine contractions), extracting features representative of the two physiologic phenomena representative of uterine contraction efficiency (cell excitability, uterine synchronization). We are presently testing the opportunity of using EHG for the home monitoring of uterine contractions on risk pregnancy women.