4 spontaneous labours.
Baby one - period pain type contractions started on a Friday night, 39+6. 1cm dilated by 11pm, came home to bed. 5cm dilated by 8am, but baby not born until 11pm. All fine but cord round neck so slow labour. Waters broken by midwife.
Baby two - 40+10, 5pm told my mum nothing was happening. By 7pm I phoned her back to come and have toddler, baby born at 8.30pm. Contractions thick and fast from the get-go. Waters broke on the loo around 30 mins before delivery.
Baby three - 40+3, severe backache and top of thigh pain, no break for a coupleo hours. Went to get checked out about 9pm and had her at 5am after a threat of c section. Turns out she was back to back with an anterior placenta which is why I experienced the pain in the way I did.
Baby four - 40+2, contractions on way home from school. Lugged all the kids' crap home and things died down til about 8pm, had a huge yellowy snotty show (my first ever!). Managed to get the kids to sleep and went into hospital around 11pm. Born at 4am, it never really started hurting that much.
So even in the same mother the experiences can be wildly different! I haven't ever known of anyone - apart from my own mother with me - to have the full splashdown of waters breaking with no prior clue, though.