My first was like that. I remember sitting with my birth support partner at an appt, and saying that I really didn't feel any niggles or anything and that I thought I'd go days over. I went into labour at 2:30 the next morning, contractions started at a regular 8 mins apart, we left for the hospital around 10am, and bub was born 1:30pm.

The only outward sign was that we'd been at mum and dad's for dinner and apparently I was in a FERAL mood, making snide comments about everyone, especially DH and being really difficult, to the point that they sort of breathed out a sigh of relief when we left.