I definately think that right now is NOT the time to be worrying about who is going to take your place at work. If you go into labor, you go into labor. There is nobody to stop that. And if you have lots to do at home I'd be getting with the program girl! LOL!
My first baby I dialated to a 4 at 36 weeks and stayed that way for about 7 days, and then I had my baby boy. He was 8lb 2oz. A big ol' guy. My second, I did the same thing, I was dialted to a 4 for about 4 days, then I had my baby girl... also a big one 8lb and 6 oz. Three weeks early. So my last I expected nothing less... and what do I know, I did the samet hing, I can't remember how long I was dialated to a 4, but I remember knowing it would happen right away once I knew. So give yourself about a week... but no more, and get ready for that baby, you will be holding it in your arms soon enough and all those worries will be just a memory.