When does the bag of waters break?

When Does the Bag of Waters Usually Break? Usually the bag of waters breaks just before you go into labor or during the early part of labor. It happens often when you are in bed sleeping. You may wake up and think you have wet the bed. Sometimes women feel or even hear a small “pop” when the bag breaks. Sometimes there is a gush of fluid from the vagina that makes your underwear wet; or maybe just a trickle that makes you feel damp. Sometimes the bag does not break until the baby is being born. In about 1 in every 10 women, the bag of waters breaks several hours before labor starts. Although rare, the bag of waters can break days before labor starts.