Woah, don't you guys get like paternity leave and "reasonable time off" for childbirth and infant illness??? That's cr*p.
Goodness if they tired that here in uk they would have a lawsuit against them for unfair dismissal (add in loss of earnings, compensation for stress to self, mother and baby and a whole host of other things).
Good luck and do what feels right. I know I would feel resentfull if himself wasn't here when things started happening.
If heather is dilating I would expect things are happening but will either progress real slow, or by the time you read this mackenzie will be on her way.
Don't make heather resent you at this early stage, it'll be bad enough when she is screaming at you that its all your fault for ever daring to come near her with a willy

I know a lot of focus is on how difficultthings are for the mother but you as the father need to let a lot go over your head and to not take any personal offence - humans are notorious for lashing out at their nearest and dearest - why? Because their nearest and dearest will forgive them and not be offended.
A job is for as long as you decide - a child is forever