pregnancy weight

Hi, I'm 5'10 and my weight before my pregnancy was 128, which by all these charts I was considered underweight now I'm in wk 17 and have gained 8lbs , .
I don't understant how they put everyone in the same catergory when you bone structure should have a lot to do with your weight.
Is anyone the same that can give me an idea of what their weight gain was, because if I look at all these charts they all say I should gain way more because I was underweight?  

[tam2girls]

Weight does not matter so long as you eat healthy and the baby is growing at the right rate. Your body will supply what the baby need you just have to look after yourself. Eat a healthy balanced diet and have an occasional treat if you feel like it and everything should be just fine. Good Luck

[1sttimer0105]

Thank you

[cocacolapanda]

Yes, eat healthy, and if you see yourself gaining too fast take a closer look at how much your eating, you really dont' need to eat a lot more when your pregnant.

I gained about 30 lb with my first pregnancy and didn't loose any of it because I started eating WAY too much after the pregnancy because I didn't control my portions during and my stomach grew.  This time I'm paying a closer attention.

If you are considered underweight or average they usually want you to gain at least 10-15 lb as that's mostly the baby and extra fluid weight.  My overweight now and my midwife said I shouldn't gain more than 20 lb, but if I don't gain anything it's just fine as long as I eat healthy and the baby is growing right.