Summary: I've seen a few posts relating to sharing pregnancy news to friends who are also TTC, have experienced loss, etc. I agree that a text makes a lot of sense so they can process in their own time. My situation is a little different and I'm wondering if a text is still the best way or if it might be too impersonal.
Full context: I have an older friend (same age as my parents) who, with her DH were very much in a sort of parental role when I was in my late teens/early 20s. We met through a local hobby club. To the extent that she was my "hobby mum" (my parents refer to her by this title!) and I send her a message every mother's day. My relationship with my own parents ultimately improved, but "hobby dad" had said he'd happily walk me down the aisle if I wanted him too. When they TTC they went on to do 10 rounds of IVF before deciding to move on, and have never had children. We meet up once or twice a year and sporadically text, mostly a sort of "check in" and to arrange our next meetup.
I am now pregnant, due mid November. We conceived through fertility treatment. We're "due" to meet up all together (all four of us) in early summer and I really don't want to get this wrong. I worry that texting, when we rarely text, would make a bigger thing out of it than necessary? But equally I don't know what her initial reaction would be in person and would hate for her to have to pretend to be happy for us.
Bottom line: If I did text, what to say? This isn't a normal "you're TTC too and we got there first" situation.