That you could get through pregnancy without any morning sickness, cravings, aversions, pelvic pain or heartburn at all
That meeting a friend's newborn at 18 weeks pregnant could cause your breasts to leak and this could continue throughout the rest of the pregnancy
That contractions could start on Tuesday morning but baby might not arrive until Friday lunchtime, and that 'staying active' during early labour is idiotic because 3 days later when you're bone-achingly exhausted, you could fall asleep standing up, in between pushes.
That natal hypnotherapy might not diminish the pain but could mean you focus enough on breathing to get through 60+ hours of labour with no pain relief.
That every single midwife, consultant, paediatrician, nurse and doctor involved could be professional, kind, compassionate, helpful and encouraging.
That a plastic jug could become your best post-birth bathroom friend.
That there is no sleep to be had on a postnatal ward so you could be sent home the day after with a newborn baby you have no idea how to care for, having not slept for the best part of a week - which is terrifying (and nine weeks later you'll still not have slept for more than 3 consecutive hours at any point).