I could use a little support

I am 11+2 (due nov 3) and I thought everyone in my family would be so happy and supportive but instead my younger sister is going to everyone and telling them I got pregnant in order to steal the spotlight from her wedding (nov 26). While we wanted kids we weren't exactly trying for one at this moment but it happened and my husband and I are happy. It breaks my heart that my only sister would even accuse me of such a thing and even worse is telling the extended family that I did this to spite her. I am heartbroken and feel like I have no support from the people I thought would be here for me the most. I just don't know what To do and I feel so alone. Thanks for listening.