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Miscarriage at 12 Weeks Into Pregnancy

A spontaneous abortion, more commonly referred to as a miscarriage, is the loss of a pregnancy before 20 weeks’ gestation. About 12 percent of pregnancies end in miscarriage before the end of the first trimester, or the 12th week, Dr. Marjorie Greenfield writes on the Dr. Spock website. After that, the statistic drops dramatically to about 1 percent.