There are some differences between Braxton Hicks contractions and true labour contractions. Your doctor or midwife will consider these differences when deciding whether you’re in labour. Braxton Hicks contractions: don’t open or dilate your cervix usually last for about 30 seconds can be uncomfortable, but usually aren’t painful come and go at irregular times usually occur no more than once or twice an hour, a few times a day — until late in your pregnancy usually stop if you change position or activity or go for a walk usually stop if you have a warm bath or shower Real labour contractions: open or dilate your cervix last 30 to 70 seconds are painful or require all of your attention become very regular, and get closer together as time passes last longer as time passes get stronger or come more often when you walk get stronger over time