Ballottement

Ballottement: This is a mid-pregnancy sign in which the fetus can be pushed from the mother's abdomen and felt to bounce back.
Positive Signs of Pregnancy
These are without-a-doubt signs that you are, in fact, going to have a baby! ...

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Braxton Hicks' Contractions--the irregular and unorganized contractions of the uterus.
Ballottement--a mid-pregnancy sign in which the fetus can be pushed from the mother's abdomen, and felt to bounce back, tapping an examining finger in the vagina.

See also: Hysterectomy, Urine, Ovulation, Uterus, Bladder