Another problem that may cause pain and bleeding in early pregnancy is ectopic pregnancy. If pregnancy occurs in a fallopian tube, it may burst. Ectopic pregnancies are much less common than miscarriages. They occur in about one in 60 pregnancies.
A rare cause of early bleeding is molar pregnancy. It is also called gestational trophoblastic disease (GTD) or simply a "mole." It is the growth of abnormal tissue instead of an embryo.
The causes of bleeding in the second half of pregnancy differ from those in early pregnancy. Common conditions that cause minor bleeding include an inflamed cervix or growths on the cervix.
The placenta may detach from the uterine wall before or during labor. This may cause vaginal bleeding. Only one percent of pregnant women have experience placental abruption. It usually occurs during the last 12 weeks of pregnancy. Stomach pain often occurs, even if there is no obvious bleeding.
When the placenta lies low in the uterus, it may partly or completely cover the cervix. This is called placenta previa. It may cause vaginal bleeding. Placenta previa is serious and requires prompt care.
Late in pregnancy, vaginal bleeding may be a sign of labor. A plug that covers the opening of the uterus during pregnancy is passed just before or at the start of labor. A small amount of mucus and blood is passed from the cervix. This is called "bloody show." It is common. It is not a problem if it happens within a few weeks of your due date.
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