If you hadn't noticed, they were both pregnant, one after another. Not the best moment to suggest anything of the sort.
As opposed to me with Severus? You should know that to every rule there is an exception, sometimes even more than one. I repeat you are Harry Potter. We celebrate your birthday. Regardless of blood status, she couldn't have found a more important person (with the exception of me, obviously), and I know that you won't fuck her over because you tend to be terribly Gryffindorish.
Or as opposed to Millicent and that Muggleborn. I might not like it, but she's happy. I want my friends to be happy and taken care of. So no, I'm not upset.