First of all, tell your husband not to assume that since you're both right handed, your children will be, too. I'm left handed, and as far as anyone in my family can tell, I'm the first left handed person in my entire family line, both on my mother and my father's side. I've always been left handed, although I've adapted to life in what I call a "Right Handed World" (my right handed husband thinks it's quite funny when I start cursing the fact that there are no things like left handed notebooks or that there are no stores around here like the "Leftorium", made famous by Ned Flanders on the Simpsons).
People are always telling me it's too early to tell if my son is going to be right or left handed, too, but I know he's a lefty. He's almost 4 now, and has been using his left hand for almost everything since he picked up his first crayon at 9 months. I certainly don't intend to change that, in fact, I'm actually proud he's left handed.
The other side to that is in the case of my younger brother. He used his right hand all the time up until kindergarten when he realized that me, his big sister, was left handed, and then he just switched. He's ambidextrous because of it, but prefers his left hand.
I know I present a confusing arguement. But the first thing is not to try and change your child and to accept him and love him for who he is.