Crabby sister-in-law

Hi friends. I am 11 weeks and thrilled. But I found out last night that some others might not be so happy. My brother is marrying a woman in September of this year. She asked me last August to be in their wedding. I hesitantly said yes because it’s my brother. Although she may not be my favorite person, I couldn’t say no. Well this brings me to my point of posting. Last night I saw my brother and his fiancée and she proceeded to tell me how all of her friends are pregnant and she is upset because she’s going to be the only one drinking at her bachelorette party and wedding. Theres five of us that are pregnant, but plenty who aren’t as well. I have not told them that I am expecting, and now that she’s shared with me how she feels about everyone else’s news I really don’t want to. She was disgusted with a girl that she isn’t even very good friends with anymore for becoming pregnant before her wedding. I don’t know how to tell them or how to deal with her once they do know. I feel as if she’s going to think I have just hoped on the band wagon even though I am further along than at least 2 of the other girls. I know I shouldn’t let this stress me out but goodness, I wish that they could just be as supportive as I am of the things they do. How do you tell someone big news that doesn’t care, or someone that will just be inconvenienced by your announcement? 😞