Ok, I normally purchase maternity clothes from motherhood. I can start out wearing smalls but normally around this time, 24 ish weeks, I need mediums. I was thinking about ordering from old navey bc they have some good deals right now. But my question is, do they run about the same size as motherhood? Or bigger, smaller... I normally wear maternity clothes for a few months after baby and I don't want the clothes to be "too" big... Tia