Up to 1 in 4 known pregnancies may end in miscarriage

Among women who know they are pregnant, up to 25 percent of those pregnancies will end in a miscarriage, according to the National Library of Medicine.

That percentage is at the top of the institution’s estimated number of knowingly pregnant women who will have a miscarriage (10 to 25 percent), but health experts say the total number of miscarriages is probably much higher because many — perhaps most — miscarriages occur early in pregnancy, usually before a person knows they are pregnant.