I have a question about weight gain?

Before i was pregnant, I weighed 218 lbs. I'm 5'8 and 28. In my first trimester I lost a total of 10.5 lbs. I'm now in my second trimester at 20w1d and I have only gained 4.5 lbs back. My question is....does gaining the weight back that you've lost count as gaining weight in your pregnancy? For instance, I'm on WIC and they told me i should only gain 11-20 lbs during the entire pregnancy because I'm overweight. They're counting what I gain back as part of it. Is that the way it's supposed to be?? I thought after you get to where you left off is where it starts but I don't know since this is my first pregnancy lol.