Weight gain and pregnancy

Anna
My doctor told me today that I've gained 23lbs already. I'm only 23 weeks. She was really concerned about it and obviously I am too. I have a very active job, I eat and snack fairly healthy. I'm so frusterated with this. I don't feel that big and yet, my weight gain tells a different story. How much did you gain with your first? 
This was last week at 22 weeks.