I haven't gained weight. 16 weeks

Kimberly • Married. Momma to a babygirl 6/16/18

I'm now 16 weeks and regardless of what I eat I have not gained a single pound. I see my doctor tomorrow for my 16 week check up. Pre-pregnancy I couldn't stop gaining weight, heck even after a burger and fries I would jump on the scale. I know it's nothing too alarming as it's still the start of the second trimester, but I'm wondering if any of you ladies are in the same boat.