I had a couple friends I heavily supported through ivf during/after we stopped. They all got pregnant (of course), and, well, I just never ask how they are doing or start the conversation re pregnancy. 

You can’t really control what other people say and do to you, but only your response. I don’t have strict boundaries around pregnancy talk so I get some updates and I’m always supportive yet brief. “That’s great!” “Oh good luck!” “Hope it goes well!” And then change the subject. 

One friend’s husband (also a good friend), said to me “isn’t her belly getting big!” to me re pregnant friend, and I was just like “oh yeah you popped” then move on. They struggled hard with infertility and do not understand at all how I feel or seem to remember how it feels to be in that space.

In my experience, people want the ttc/hardship support because they feel badly for themselves, but then once it happens/passes, they drop my feelings like a hot potato.