Uterus didelphys (sometimes also uterus didelphis) represents a uterine malformation where the uterus is present as a paired organ when the embryogenetic fusion of the Müllerian ducts fails to occur. As a result there is a double uterus with two separate cervices, and often a double vagina as well. Each uterus has a single horn linked to the ipsilateral fallopian tube that faces its ovary. In non human species (e.g. nematodes), a didelphic genital tract may be normal rather than a malformation. Such species are described as didelphic, as opposed to monodelphic, with a single tract. Some women have a double uterus and never realize it — even during pregnancy and childbirth. Each cavity in a double uterus often leads to its own cervix. Some women with a double uterus also have a duplicate or divided vagina. Possible signs and symptoms may include: Unusual pressure or cramping pain before or during a menstrual period. Abnormal bleeding during a period, such as blood flow despite the use of a tampon. When to consult a doctor If you have signs and symptoms of a double uterus, make an appointment with your doctor. An early diagnosis is especially important if you plan to become pregnant or if you've had repeated miscarriages. Your doctor can recommend treatment options to improve your chances of getting pregnant, staying pregnant and having a safe delivery. If you've been diagnosed with a double uterus and are considering pregnancy, talk with your doctor first. Together you can make a plan for optimal care during pregnancy and delivery.