Just as every pregnancy is different, every delivery is unique. The simple truth is, there’s no way to predict exactly when you’ll go into labor. In fact, no one even knows for sure what triggers the big event, although hormones are thought to play a part.Click to see full answer. Also to know is, can you predict when Labour will start?No one can predict with certainty when labor will begin — the due date your doctor gives you is merely a point of reference. It is normal for labor to start as early as three weeks before that date or as late as two weeks after it.Similarly, what triggers the start of labor? Researchers believe that the most important trigger of labor is a surge of hormones released by the fetus. In response to this hormone surge, the muscles in the mother’s uterus change to allow her cervix (at the lower end of her uterus) to open. Moreover, what are some signs that labor is nearing? This article describes the 10 most common signs and symptoms that labor is approaching. The baby drops. Medically known as “lightening,” this is when the baby “drops.” An increased urge to urinate. The mucus plug passes. The cervix dilates. Thinning of the cervix. Back pain. Contractions. A burst of energy. Are you more likely to go into labor overnight? You are more likely to go into labor at night. Whatever the true evolutionary reason, our modern bodies continue to maintain a nocturnal birth rhythm. Contractions tend to peak in intensity between 8:30 p.m. and 2:00 a.m., and labor itself most often begins between midnight and 5:00 a.m.