Thanks for your reassurance about my bump's size, Dwayne, good to know!
I laboured at home for most of the time - contractions were a few mins apart, went to the hospital at midnight and was told to go home as not 'officially' in labour as not dilated yet.
So we went home, I ran a bath and lay in it, doing deep breathing etc. After a couple of hours I started to feel sick & shaky, and then began, well, mooing is the only word for it - bellowing it to expel lots of air from my lungs which really helped with the contractions. DH recognised this as being in 'transition' and ordered me out of the bath, into clothes and into the car! This was at about 5:30am, we were at the hospital at 6am and DS1 was born at 8:30am.
I'd definitely say that if you get to the point where you're showing any signs of being 'in transition' (sick, shaky, scared, suddenly feeling 'different' or 'weird') you need to get to the hospital asap!!