People are inconsiderate

So the picture on the left is me 3 months before I got pregnant and on the right is me now at 26w3d. As you can see I wasn't very big to begin with so yes it's going to be more obvious that I'm getting bigger day by day and in all honesty I've only gained 19 pounds since day one. But people LOVE pointing out how huge I have gotten or that by the time I reach the end of my pregnancy I'm going to "look like a blimp". I don't feel like I'm gaining anywhere other than my belly either but people are quick to point out how much bigger I am now. Does anyone else have this problem and if so how do you brush it off or politely say something because I'm having a very hard time holding back what all I would love to say to them.