Im freaking out

So i just took a pregnancy test and it came back positive. I know once me and my husband tell everyone my m-i-l is going to be a complete bitch and be extremely mean. Shes been telling me "you dont need another baby" blah blah blah and i can hear her now saying negative things about me being pregnant with a 9 month old. She's always trying to bring me down about something. How can i handle my negative m-i-l when we decide to tell everyone we are expecting baby number 2? I know everyone else is going to be excited (kinda ify about my f-i-l though)