Oh chick - sounds awful for you, I totally can see where you are coming from and 10yrs of being ignored/treated like crap and then suddenly, because you're pregnant, then want to know you!?! thats just two-faced and rude IMO.
I can understand wantin to be civil and to be honest, I don't think you need to be much more then that. If you don't wish to speak to them, don't answer the phone (assume you have caller id?) or if hubby answers and goes to pass the phone to you, decline it....you are perfectly entitled to do so and if your hubby doesn't understand after 10yrs of illtreatment, then i'm afraid thats his issue to get over and not yours.
I'm not sayin go all out and be a cowbag with them, you defo sound like the bigger person in all of this and I think being civil and polite is the key - I too could not forgive and forget 10yrs but then i'm a very stubborn person.
i'm actually a bit peed off for you - I'd hate nothing more then to have inlaws who treated me this way then want to be my best friend as i'm pregnant - it would actualy make me want to ignore/reject them to see how they feel, but as I say, i'm stubborn and can be quite petty about people at times

blood is not always thicker then water in my eyes.
Good luck chick x x x