Not what was your first sign that labor is about to happen, but at what moment--what was happening to your body--that made you realize "this isn't a drill, this is really happening!?" Was it water breaking? A painful contraction? I feel like I keep having moments where I'm like "is this it?" but I assume I will really KNOW when it is (says the impatiently waiting 40w5d pregnant lady :). Any stories much appreciated!