Dee, try to stop stressing, because that wont be doing you any good...

Can your DF, discuss the situation with his work?

They do really come when they want to... OB's guessing is what it is... there is no 100% guarantee answer...
He is saying in his experience etc, etc.... But taht doesnt mean your not an individual & bubs might not want to come out yet!!!

So try to relax!