What would you (like me to) say?

On another ttc app there was a thread about where everyone was from, I got in touch with someone from the same country. We kept the conversation going there from time to time but decided to not have contact outside of the app. We liked that we were anonymous and getting to personal may change things. Well here is the thing. It started in mid 2016. She would start to ttc and I was not ttc but also not preventing all the time. Eventually I got pregnant and became a mom in sept 2017. I did not tell about my pregnancy because I kind of thought she would get pregnant in the meantime. (Btw there was also a third person in the conversation that got pregnant at the start) So I felt bad to announce mine and to give her stress about her still not being pregnant. Fast forward to now, after a period wherein the conversation kind of paused, life got busy with newborn and I had to use an old phone that didnt support that particular app.. Recently got a new phone, and checked upon her to see how she was doing. I planned to tell her about my life change. But.. she told me she wasn't pregnant and experienced a miscarriage once. So now I really feel bad to bring up that I've become a mother. It was never my plan to wait till now, but things happend the way they happend. What would you do if you were me? What would you like me to do if you were her?