Weight gain question.

I'm 10 weeks and 3 days today and I already feel like I'm showing.. The thing that scares me about this is my mother in law was telling me about her miscarriage and she said "the doctors knew i was gonna lose it.." And i asked how did they know and she said "its cause my stomach like doubled in size and i was only 3 months."

So she blew up too and im so scared. I want to be excited about my belly getting bigger but i cant stop thinking about what she said.. Somebody please help me get out of this constant worry. I want to be happy not worried! :(