my sister is mad about me being pregnant 😔

My sisters wedding is in January. I will be 6 months pregnant and I'm her MOH. I told her yesterday that I'm pregnant and she is not happy :( I feel so bad and guilty.  She wanted a classy winter wedding and now me and her other bridesmaid will be pregnant. She didn't say anything to my face but my mom told me she cried about it later that day. She hasn't answers a text I sent her today, and she had her fiancé pick up her dog from my place instead of her. Ugh so awkward. Idk what to do