Weight gain during pregnancy

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How much have you gained, and how much does you doctor care about it?
I started my pregnancy at 120lbs and am now 140lbs (29 wks preg). I have been gaining about 6 to 7 lbs a month since my morning sickness went away. 
I do not feel like I look fat or unhealthy, but my doc is making a big deal about my weight, telling me to slow down. It is just one more thing for me to worry about. I am constantly hungry, and barely ever eat out. I make my family's meals at home. 
I am just wondering what other women have been told about their weight and its importance.