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It is not common, but it happens. You probably conceived twins and one did not develop, it is called a blighted ovum. If you had conceived a single baby and it had not developed you would have had a miscarriage, but the healthy fetus is preventing this. As the healthy baby grows the second placenta will probably be overtaken by the good one. An area of thickening may be found when you have your baby.

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Q: Is it common to have two placentas developing during pregnancy one empty and one with a live fetus What will happen to the empty sac as the pregnancy progresses?
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