As many as 75% of miscarriages are chemical pregnancies. Some factors increase the chances of having a miscarriage of any type. Women between the ages of 35 and 45 have a greater chance of miscarriage than younger women. Those at greatest risk are women over 45, who face a 50% chance of miscarriage. Women who have had a previous miscarriage have a 25% chance of having another one, which is only slightly higher than the risk for a woman who has never had one.

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