Pregnancy Brain

It seems that everything I read is related to pregnancy now that my sister's first baby is due in late June, my cousin will have her second (first-try) baby six weeks later, and quite a few friends are also due this summer. This article really made me think about the differences between pregnancy and adoption; it talks about how the hormone changes during pregnancy get the brain ready for mothering. My brain won't have that time to prepare. I don't doubt that I will eventually love my child completely, but will it take me longer? Will I not be as attached? Or as protective? When will those hormones kick in? How long will it take my brain to figure out I'm a mom too?... I am so excited about adopting someday, but I am also realizing how different it will be from everyone else's experience.