Bode Miller's wife, volleyball champ Morgan Beck, is no longer pregnant ... announcing on Twitter that she lost the baby this weekend.
Morgan announced the miscarriage Saturday, tweeting "Pretty hard morning. We lost the baby. Pretty broken hearted, but getting through it."
FYI -- Morgan and Bode married in October and only recently announced the pregnancy in December.
As TMZ first reported, Bode just filed paternity lawsuits against two other women, claiming he is the biological father of two children ... one a 4-year-old girl, and the other has yet to be born.