A left uterine horn pregnancy at five weeks of pregnancy needs to be combined with the ultrasound results, and the pregnancy can continue if the baby’s buds and fetal heart are normal. When the ultrasound examination at five weeks of pregnancy indicates a pregnancy in the uterine horn, as the embryo is small at this time, the gestational sac may grow towards the uterine cavity with the increase of gestational weeks. If the embryo grows toward the uterine cavity and the fetal buds and heart are normal, the pregnancy can be continued, but when the embryo grows toward the uterine horn, the pregnancy needs to be terminated in time. Horn of the uterus pregnancy is also a kind of ectopic pregnancy, due to the thick muscle layer of the uterine horn and rich blood flow, once the rupture of horn of the uterus pregnancy can quickly cause hemorrhagic shock and other serious complications, so once the diagnosis is clear, we need to follow the doctor’s advice according to the condition of the formulation of a treatment plan, in order to ensure that the pregnant woman’s life is safe.