I swing between different feelings (much like my first pregnancy), usually depending on how tired I am. I suppose I have the benefit this time of knowing it really is all worth it in the end (you know, when it sticks).
I'm worried we won't be able to cope with two, that we haven't given DS enough time as an only child (but then, subsequent children never get that luxury anyway), what others will think about it being too soon (but then my OH says it's no-one's business but ours), that I should have saved what may be my last pregnancy for later so I could really savour it. Sometimes (often), I forget I'm even pregnant, like it's still a half-thought in the back of my mind and it hasn't actually happened yet. DS's conception was preceded by much broodiness, waiting, name-choosing, disappointment, heartbreak... but this one is so out of the blue that I have to keep reminding myself that in 7 and a half months I could be holding a newborn again!
Whatever you're feeling, go with it. I'd like to be able to promise that you'll feel better in a couple of months, but I can't. But the statistics are with you. In the meantime, rant away. It's always nice to know you're not alone 