Big baby

So I went for my 20 week anatomy scan today. I went to a specialist because of my weight ( who is not my regular OB) but the doc there told me my baby is measuring in the 99th percentile. She also told me my baby is a big baby. And that comes with more risks. I have never experienced this before. And I’m kind of scared at the thought of a big baby coming out of me. Or either of us being sick or something.She also wants to move my due date 2 weeks earlier ( which would put me at the date for my LMC) but she will leave that decision to my OB. I’m totally freaking out. I’ve been doing everything right. I drink hella water, I’m eating healthy even though I want some pizza right now, I walk and do light exercise daily. Is it normal to have a big baby because I’m a bigger mama??? I’m so scared and confused.. I’ve been crying since I left my appointment