During pregnancy, the placenta moves as the uterus stretches and grows. In early pregnancy, a low-lying placenta is very common. But as the pregnancy progresses, the growing uterus should "pull" the placenta toward the top of the womb. By the third trimester, the placenta should be near the top of the uterus, leaving the opening of the cervix clear for the delivery.
Sometimes, though, the placenta remains in the lower portion of the uterus, partly or completely covering this opening. This is called a previa.
There are different forms of placenta previa:
* Marginal: The placenta is against the cervix but does not cover the opening.
* Partial: The placenta covers part of the cervical opening.
* Complete: The placenta completely covers the cervical opening. Types Of Plasenta Previa
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