Family member not happy or excited :(

My mother doesnt know yet. But we got a bunch of snow where I live. And I jokingly said that there was gonna be a baby boom because everyone is snowed in on March 5th. She said you better not be! I didn't say anything to her but now I feel bad. And I'm almost afraid to tell her. I'm unsure if I should tell any friends or family. I already have a big family so instead of getting excited most of them say insensitive things. Anybody else have a family member that's not excited? How are you dealing with it?