I only had very vague idea of due date as my periods had been all over the place.
12 week scan said due date 11 dec (didn't change at 20 wk scan) but I'm at 32 weeks and feel much further along than with dd- bump dropped, up in night all night peeing for weeks, drooling in sleep, heartburn suddenly stopping- all of which were around 36 weeks last pregnancy.
Might be reading too much into it all but I feel like baby is coming soon.