When it comes to shopping for maternity panties, you never want to take the chance of them being too small because of two things: One, they’ll end up being constrictive and two, they’ll be incredibly uncomfortable. Most panties have sizing charts and they’re all fairly stretchy to grow with your pregnancy, but many do run small as well. Depending on the style of maternity panty you’re going for, it’s better to size up than get a size too small and feel uncomfortable with panties that just simply don’t work.