AIO - friend’s pregnancy announcement

I was hoping to understand how you would feel about this as I’m so conflicted. I had a miscarriage about 6 weeks ago, it was a second trimester miscarriage which as we can all imagine has been traumatic AF. I’ve been on the healing journey and a friend messaged me yesterday asking if I could look after her child because she had to run some errands. In the evening she messaged me saying thank you for looking after him, and then told me she was pregnant but just like a yay I’m pregnant, and then said that the reason she needed me to look after the child was because she was too nauseous due to pregnancy to look after him. I’m quite hurt by this whole thing, it feels so tone deaf and I’m so shocked. I can’t really talk to many friends about this because we have so many mutual friends, I don’t want to be the one causing drama on our friendship group and driving a wedge but I’m really quite upset by this. Should I let it go for the sake of the friendship group or do I have a valid reason to be upset? I will caveat to say she really hasn’t been there for me at all during the miscarriage when everyone else has been amazing, I guess now I know the reason why but still, I was already hurt by her before all of this due to her absence.