Apparently, my ass is getting bigger...

Tomorrow is 24 weeks and I have been doing pretty well with my weight gain, about 10 pounds total.  Over the last 2 weeks though, co-workers have been commenting on the size of my butt.  Today's quote was, "I thought the belly was supposed to get bigger, not the backside."  I have noticed that my clothes are fitting a little differently and I haven't been climbing as much as before, and we did take 2 vacations in 1 month, but seriously.  Do people think that just because I am pregnant they have the liberty to say whatever they want about my body?  I'm sure no one means for it to be malicious, but I can't help being a little offended.