miscarriage, often referred to as a “spontaneous abortion,” describes the loss of a pregnancy, usually occurring within the first 20 weeks. About 80 percent of all miscarriages happen before the completion of the first trimester.
Research shows that 10 to 20 percent of women who know they are pregnant experience a miscarriage. This does not include the situation that 30 to 50 percent of fertilized eggs are lost before one gets pregnant which happens too early to even realize it.
9 Common Miscarriage Causes
The miscarriage causes are not always clear.