The best time to go to the hospital for labor is when you have regular, painful contractions lasting about one minute each and occurring at least every five minutes for more than one to two hours. This indicates the transition to active labor. Additionally, if your water breaks, whether or not you are having contractions, you should go to the hospital immediately to reduce the risk of infection. Other reasons to go or call your doctor include heavy vaginal bleeding, decreased fetal movement, severe abdominal pain, or if your intuition tells you it's time. For a first baby, contractions lasting 45 to 60 seconds and occurring every 3 to 4 minutes for at least two hours usually indicate it's time. For subsequent babies, contractions every 5 minutes for an hour is often the guideline. If any unusual symptoms occur, such as green or brown fluid or heavy bleeding, go to the hospital immediately or call emergency services.