Medical Definition of Uterine contraction

Uterine contraction: The tightening and shortening of the uterine muscles.

During labor, contractions accomplish two things: (1) they cause the cervix to thin and dilate (open); and (2) they help the baby to descend into the birth canal.

Uterine contractions also occur during the monthly menstrual cycle and are recognized as menstrual cramps.

QUESTION

The first sign of pregnancy is most often: See Answer