False labor is a condition that females undergo during pregnancy, in which they feel they are about to give birth, but it does not occur.
In 2378, B'Elanna Torres woke up early in the morning on the USS Voyager and told her husband, Tom Paris, that their child was due to be born. The two went to sickbay and The Doctor scanned Torres with a medical tricorder. He found that she was experiencing false labor, which was common in Klingon-Human pregnancies. (VOY: "Endgame")