My second and third labours were very similar. Both started around 8am but with ds2 the contractions were strong and regular right from get go and with dd I had a lot of niggly pre labour type contractions that ramped up to active labour at around 4. Her head was still quite high the day before at my midwife appointment so i think that was all getting her into a good position. Once she was it was all on! He was born at 5 and she was born at 5:51. Ds1 labour was completely different. Waters breaking at 3am and induced after 12 hours due to no contractions. All of my kids were also born on the start of a specific week. DS1 38 weeks, DS2 41 weeks and DD 40 weeks.