It constantly happened to me when I was pregnant. I'm about 115 lbs and 5'3" when I'm not pregnant...and I put on 62 lbs with both pregnancies. I kid you not. I was huge. And it was mostly in my belly...so yeah, I looked big. But the constant comments!! My pregnancy brain didn't allow any clever responses, but one day my DH actually got fed up with it all. Some rather large woman was commenting on my body and DH snapped "Yeah, but in two months, she'll lose it all and have a baby. What's your excuse?!". Probably not the nicest thing to say to someone...but he was pretty tired of all the comments...as was I.