Hurt feelings

Ko00021
I was at the store to find some maternity pants so I could have a few for when I get any bigger. I needed Capri length because well I'm 5'0" and short so they're barely in season now. 
So as I have these pants to figure out the fit in every way except the belly the sales associate asks me why I need them and that I couldn't be pregnant.  I told her I was 4 months.  I'm not bloated at this point so it's mostly baby but I am carrying small. When I told her I was 4 months she no joke told me I was too small and I needed to eat more.  I really truly hurt my feelings. I've been really strong about not always agreeing with others but for someone to say that to me it hurt my feelings a lot. I eat  extremely  healthy and my doctor thinks I'm extremely healthy and the baby is measuring perfectly.  Has anyone else dealt with something like this?