Oh boy! I've been getting the "big" ,"small" thing too!.
I had one customer on monday, who when I told her I'm 17 weeks pg, she said "oh gee, you're not showing yet are you!, Then the very next customer asked me how long I had to go, (with out me telling her I'm pg) and when I said May, she said " Oh my! your huge! I thought you must be nearly there!!"
Honestly! I give up!