I have found that a swift kick to the rear generally snaps them out of it. Just kidding!
Seriously, when the time gets here and the pups are coming, you will be calm and cool knowing you did what you needed to do to prepare yourself. (And your girl will thank you!) You hubby who has joked the whole time and speant time harrassing you will probably faint, so you may want to add a pillow for his poor head to your supplies as well.
Just don't stress the mama and follow her lead. And tell your hubby to butt out if he can't stop being insensitive for 2 seconds! When it's all said and done, laugh at him and say "I told you so!"
Good luck!