How to announce our pregnancy to struggling to conceive couple?

How are you /would you announce your pregnancy to a couple who's struggling to get pregnant?

My SIL has been trying to get pregnant for over a year now with no luck. We got pregnant this time on first try (third pregnancy, second baby). We are not super close, but see her and her husband regularly and I know how much this type of news can hurt when you are desperate for a baby.

So should we do it face to face? Over the text? Let them find out same time as everyone else or give them heads up? My head is exploding with what would be the best way to tell them🤯

Thank you!