we can time conception dates to within a few hours by scans etc, can tell who the father is by DNA testing (or in DS's case, by looking at him next to DH), can in some cases accurately predict the birth weight by scans, can diagnose all sorts of anatomical issues in utero, but somehow there is no fool proof way of telling when baby will actually bloody arrive (unless you have a ELCS, of course).
why can't the body have some obvious sign, like belly button popping out 24 hours before labour starts, or fingernails changing colour, or SOMETHING.
or some nice hormone changes that piss sticks could pick up on?
rather than niggly cramps for weeks on fecking end, which may mean something, but probably don't. 
not that I am pissed off at the moment, oh no