Frequency of uterine malformations having an impact on reproduction is difficult to assess. Their detection requires specific exams (hysterosalpingography, hysteroscopy, laparoscopy). Spontaneous fertility can be altered depending on the type of uterine anomaly. All these anomalies can affect the evolution of the pregnancy: early fetal loss and late fetal loss, ectopic pregnancy, premature delivry, premature birth,vascular pathologies in pregnancy and fetal growth restriction. Ovarian function is not changed. Bicornuate uterus is the most common uterine malformations representing about half of the anomalies of the uterus. Surgery, including endoscopic allows precise diagnosis, assessment of prognosis and treatment improving the chances of conception and evolution of pregnancies. The occurrence of such a pregnancy is a dangerous situation that can lead to maternal death, but early diagnosis and good following can carry pregnancies to term. Ultrasound screening should allowed the identification of such cases in order to take preventive measures. We report a case of a bicornualunicervical uterus in a pregnancy at 38 weeks of gestation diagnosed during ultrasound first trimester of pregnancy.