Have you gained weight during pregnancy ?

For those of you ladies that haven't gained any weight , or for those who are like 30 weeks and have only gained like 10 pounds please tell me how you do it ? 
I can't help but wonder like I don't mean to offend anyone by saying " do you not eat " but do you ladies watch what you eat or what is it that you do ? I'm curious because i'm a little chubby and don't want to gain so much weight during this pregnancy any comments are welcomed and once again I don't mean to offend any of you ladies 

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