The average first time mother goes 41+1. A lot of second time moms go earlier than their first (not always true, but typically so). Personally, I went 41+5 with DS1. So when i went 38+3 with DS2 i was honestly surprised! I knew that statistically i could go earlier, but i was just banking on going so far "overdue" again.
For me, my water breaks before labor starts. With DS1 contractions started about 3 minutes apart as soon as my water broke (which was just a little leak while peeing so i wasn't for sure until it just wouldn't stop). My water broke around 3:45am at 41+4. I had a lot of painful back labor with him. I threw up at 5CM, was in transition for 9 hours and pushed for 6 hours, the placenta was well over 30 minutes before it detached. I was severely anemic and reached the max blood loss amount, so they gave me the pit shot and that expelled everything. At no point during my labor did EVER experience regularly timed contractions. I started pushing at 8CM (which apparently is common with posterior-face up- presentations). 30.5 hours after my water broke (9:17am at 41+5), baby boy #1 was born. I had an intervention free water birth, in the hospital. it was a very long and painful labor, but again that was mostly due to him being face up (back labor is very common with that as is a longer labor).
With DS2 my water broke first at 38+2 (7:30am), when i rolled over to wake up. GUSH! it was a serious gush (like movie style!). I never even experienced one contraction until about 3:30 that day. Then i had very irregular contractions (no back labor this time though- THANK GOD!). I would get them at 7 min apart, then 13 minutes, then 4 minutes, then whatever (im seriously not convinced i will ever have "normal" contractions

). When i would use the pump, i would get more contractions. When i stopped using the pump, my contractions would die out. Even the MWs said it was the strangest thing they have ever seen. I even took black cohash to get them going and that didn't work. Finally, i got to active labor (4cm) around 2pm on 38+3. It took a long time to get there, but once i got to active labor, i went from 4cm to placenta in under 1 hour and 15 minutes. I threw up again around 5CM. My contractions (once active hit) were double peaking. they would last around 2 minutes (very intense!) and then i would get about a 15 second break and another 2 minute contraction would come along. Obviously why my active labor, pushing stage, and 3rd stage were so fast! I pushed for 23 minutes, according to notes. I delivered DS2 @ 3:03PM on 38+3. The placenta delivered in 7 minutes (physiological 3rd stage, no issues with blood loss this time). I had shoulder dyscotia, but even with that pushing was still super fast. I also started pushing around 8CM this time too. He was also a water birth, but a HB. Intervention free.
I drank RRLT throughout my entire pregnancy with DS2 (1st, 2nd, and 3rd trimester). I believe that is why, once active labor actually started, it was so fast. I do not believe it had anything to do with going early (it doesnt which is fact), but it does help tone the uterus and make it work more effieciently. I totally think it had everything to do with how quick, intense, and ongoing my contractions were. But honestly i would take double peaking intense contractions for a fast birth, any day over a long back labor hellish birth. I didn't start RRLT until 34 weeks with DS1. Even though i had a long labor with DS1, i was told that is still pretty fast for birthing a persistant posterior.
So there were a lot of similarities (especially with my water breaking first, both arrived around 30-32 hours after that happened) and it taking forever to get into active labor, and never having "regular contractions"). But it was also very different at the same time.
I really hope my third birth goes something like my second...though i would love it if it didn't take forever to get into active!