You can know the exact day you had sex, but not fertilisation or implantation - doesn't all happen instantly I think we just need to be able to trust our bodies, trust our babies and trust that we WILL eventually labour. Mother Nature didn't just put in all this hard work so that babies would stay in there forever!

Also when we are in hospital with broken waters, then often restrictions are in place - how long had the waters broken? Were you on the bed / monitored? Were you encouraged to be active and upright and walk / stairs so you could move your pelvis for your baby? How long were you given? Like Michael says, all this birth stuff has so many variables.