for me with my first it was night time after a longs days work. i started to have cramping in my back. My belly never cramped or hurt or anything it was just like cramps in my back. water never broke on its own the hospital did it for me. as u know every pregnancy is different and your could be total different.
Actually, often the doctor or midwife has to break the water part way through labor. Contractions probably will start gradually and work up in intensity and duration so you would have time to get home. There are exceptions, of course, and second babies can come fast, especially if you're already dilated and effaced.