Telling an IVF sibling about pregnancy

Hey yall, there’s a bunch of people who’ve already asked a similar question. And I’ve read those posts. But my bit of nuance here is that my sibling (F) is pregnant, too. So she used IVF, and most of the advice is for telling friends who are currently TTC with IVF, not specific for those who are pregnant. I imagine she will still have feelings and may need some space. I plan to text. Should I tell her I know she might want some space? Do I just tell her without caveats?

We have a good relationship, but she isn’t always forthcoming/is very private and didn’t share anything about her IVF journey with me or any of her friends/family.

I am scared and want her support. I’m also excited for us to share this experience. But I also want to hurt her as little as possible and I know this is a sensitive topic.

Baby is wanted/intentional. We’re both married and are Irish twins, but I’m older.