I wondered the same thing about 'dropping'. My friend told me that sometimes they do, but not always. I also checked for milk this morning and none coming out, but then again I don't want to hurt her either. It feels like swollen behind each nipple though, like a bag of milk up in there. I think I read somewhere that it is normal, but it is not down into her nipples yet. I can't recall where I read it...been doing so much reading!
I did print up the section from here on pregnancy, labor and delivery in cats. I want to be prepared as best I can!