With DD my instinct was girl at the positive test. DH and I would've been happy with either, but for some reason we both thought it'd be easier to have a girl first (not sure why!).
I was all about peeing on stuff to predict the gender for fun (yeah, I know, they're not accurate!). The baking soda test gave me boy first and then girl twice. Even though my gut said girl, I convinced myself we were having a boy. I tried intelligender at 16 weeks and got boy, and was surprised at our gender reveal party to find out I was originally right with girl.
My gut reaction with this one is girl (if it progresses). We'd love to have either, but a girl would be much easier since we already have all the girl clothes we could possibly need, but we'd still be happy with a boy (just buy boy clothes slowly!). Plus we'd have to eventually figure out the room situation (which really wouldn't be an issue for several years).
DH asked me what I thought we'd have. Since the pregnancy was unplanned and a complete shock, I said we'd probably have a boy since our universe was already turned upside down, so let's just throw a boy into the mix
But really, we'd be absolutely thrilled with a girl or a boy just as long as the pregnancy progresses and baby is healthy. The rest is meaningless without that.
I did tell my mom during that first week I had known (before everything else started) that I just want to pee on a bunch of stuff right now (they were trying to stop me from POAS obsessively) - pee sticks, baking soda, etc. My mom thought I was nuts. While not accurate, I just find it fun. Something to do to pass the time.