has a plus size section, too.
Depending on where you gain weight, you can also buy regular clothes in a size (or two) bigger. I am 20 weeks pregnant (with twins) and lost quite a bit of weight in my first trimester (damn hyperemis) and haven't gained much back, so I am still in my pre-preg jeans... but I recently ordered a pair of drawstring pants and some tank tops that are a size too big from Lane Bryant
and I still have lots of room to grow into them. I am obviously pregnant, and look more like I'm 7-8 months pregnant rather than 5 months... but in this pregnancy, I have only grown a belly. In my first, I got bigger EVERYWHERE else!