Thanks everyone! Ah, I don't know why I'm so bothered. I've posted many a thread about their behaviour and nothing will change. They haven't really bothered with me in five years, so why would they now?
DH thinks it's 'just the way they are' ... I think it's beyond rude.
It's okay. I came to the conclusion last night that until either text, call, or visit me, and say one complete, polite, sentence - I'm not sharing any pregnancy related information. If it continues until my due date, then they aren't seeing the baby. Petty as it sounds, if they can't be arsed with it's mother, why should they get to see it.
So at least that's decided and I never have to think about them again 
Good luck to everyone with scans today!