Most hospitals will admit you once your cervix is dilated to about 6 centimeters, which marks the start of active labor. Before that point, you’ll likely be sent home or told to wait it out. But dilation alone isn’t the only factor. Your contraction pattern, whether your water has broken, how far you live from the hospital, and whether this is your first baby all play into the timing.
Why 6 Centimeters Is the Threshold
The American College of Obstetricians and Gynecologists (ACOG) defines active labor as beginning at 6 centimeters of dilation. This is the point where your cervix is opening rapidly and predictably, and it’s when hospital-based care becomes most useful. Before 6 centimeters, you’re in early labor, which can last many hours and progresses slowly. Most providers will encourage you to stay home during this phase because being in a hospital bed doesn’t speed things up and can actually lead to unnecessary interventions if labor stalls temporarily.
The full journey is from 0 to 10 centimeters. At 10 centimeters, your cervix is fully dilated and you’re ready to push. The shift from early to active labor at around 6 centimeters is when contractions get significantly more intense, closer together, and harder to manage on your own.
Track Contractions, Not Just Dilation
You can’t check your own dilation at home, so contractions are the practical signal to watch. The traditional guideline is the 5-1-1 rule: contractions every 5 minutes, each lasting a full minute, for at least 1 hour. More recent recommendations push this to 4-1-1 (every 4 minutes) or even 3-1-1 (every 3 minutes) before heading in, since arriving too early often results in being sent home.
Time your contractions from the start of one to the start of the next. Early labor contractions are often irregular, maybe 7 to 10 minutes apart, and feel like strong menstrual cramps. As they move closer to that 4- or 5-minute window and become intense enough that you can’t talk through them, that’s your signal to go.
When Your Water Breaks
If your water breaks, head to the hospital regardless of how dilated you think you are. This is true even if you’re not having contractions yet. Once the amniotic sac ruptures, the protective barrier around your baby is gone, and the risk of infection increases the longer labor takes to start. Your provider will want to confirm the rupture, check for any signs of concern, and monitor you closely.
Sometimes it’s hard to tell whether your water actually broke or you’re just experiencing bladder leakage, which is common in late pregnancy. If you’re unsure, go in anyway. A quick test at the hospital can confirm it.
Second Babies Come Faster
If this isn’t your first delivery, plan to leave earlier than the standard contraction rules suggest. The first stage of labor for first-time mothers can last 12 to 19 hours, but it’s typically shorter for women who’ve already given birth, averaging around 14 hours. That difference might not sound dramatic, but the active phase in particular can accelerate quickly in subsequent pregnancies. Women having their second or third baby sometimes go from 4 centimeters to fully dilated in a fraction of the time it took the first time around.
If you had a fast first labor (under 6 or 7 hours total), take that as a strong signal to leave for the hospital on the earlier side with your next pregnancy.
Factor In Your Drive Time
How far you live from the hospital matters more than most people realize. Research published in Contemporary OB/GYN found that women who travel 20 minutes or more to their hospital at full term face a 27% increase in adverse outcomes, including low Apgar scores and NICU admissions. Neonatal mortality within 24 hours increased by 50% for those with longer travel times.
If your hospital is 30, 40, or 60 minutes away, you should leave well before contractions hit the 4-1-1 or 5-1-1 pattern. Talk to your provider ahead of time about when to head out based on your specific commute, and account for traffic, weather, and time of day. Having a bag packed and a plan in place by 37 weeks removes one layer of stress when the time comes.
Situations That Override the Rules
Certain warning signs mean you should go to the hospital immediately, no matter how far apart your contractions are or how dilated you might be:
- Vaginal bleeding that’s heavier than light spotting, especially bright red blood
- Decreased fetal movement where your baby is moving noticeably less than usual
- Severe headache, vision changes, or sudden swelling in your face or hands, which can signal preeclampsia
- Acute abdominal pain that’s constant rather than coming in waves
- Preterm labor signs before 37 weeks, including regular contractions, pelvic pressure, or fluid leaking
These aren’t wait-and-see situations. They require immediate evaluation.
If You Test Positive for Group B Strep
About 1 in 4 pregnant women carry Group B Strep bacteria, and if you tested positive during your third trimester screening, your timing shifts slightly. You’ll need IV antibiotics during labor to protect your baby, and ideally those antibiotics should run for at least 4 hours before delivery for maximum effectiveness. Even 2 hours of antibiotic exposure has been shown to reduce bacterial counts and lower the risk of neonatal infection.
This doesn’t mean you need to arrive at the hospital dramatically earlier, but it does mean you shouldn’t push your timing to the last possible minute. Let your provider know as soon as contractions become regular so they can advise you on when to come in. If labor is progressing quickly, the priority is still getting you to the hospital for delivery. Antibiotics won’t delay any necessary interventions.
What Happens If You Arrive Too Early
If you show up at the hospital and you’re only 2 or 3 centimeters dilated with mild contractions, you’ll likely be monitored for a short period and then sent home. This is completely normal and happens frequently, especially with first pregnancies. Some hospitals will have you walk the halls for an hour or two and recheck you. If there’s no significant change, they’ll discharge you with instructions on when to come back.
Being sent home can feel discouraging, but it’s generally better for you and your baby. Laboring at home in early stages lets you move around freely, eat, drink, shower, and rest in a comfortable environment. All of those things support labor progression more effectively than lying in a hospital bed attached to monitors.