Belly size

So I know I have a big belly, but it's all baby. This is also my second child. I just don't understand what gives people the right to comment on how big I look or ask if I'm sure it's not twins or if my due date is right. I'm so sick of the comments about how I can't possibly make it to my due date in 10 weeks and 5 days. Seriously?! I feel big enough already and I don't need snarky comments about my size. I'm self conscious enough walking around with a belly that probably has it's own gravitational pull!! Btw, I am 29+2 and have only gained 10.4lbs so far.