I'm round at my in laws this evening and my partner has told them about the pregnancy. Although on the phone (not when I was there).
We're not married, so they're not officially my in laws.
I've always got on well with them. However when I mentioned something very subtle about my pregnancy and not being able to eat Brie, MIL couldn't look at me and started saying something about blue cheese and looked embarrassed. She then changed the subject pretty quick.
Neither of them have congratulated me or spoken to me about it. It's all very odd.
I hope they don't disapprove. This will be their 5th grandchild.