I know JUST how you feel! When I was pregnant with my (very wanted and planned) second daughter, I was *terrified* I wasn't going to love her as much as my first. And my first was such a high-maintenance baby I worried that if baby #2 was like that I'd never be able to spend any time with my first!
But as soon as she came, and ever since, our second has been our own little ray of sunshine :o) And I never had to divide my love....more just appeared for her (and my third too). And cost-wise? we already HAD all the big-ticket items that were basically brand new (my first 2 are 20 months apart) and the clothes we just passed down as well. Our only 'new' cost was diapers.
I went through the 'what were we thinking' bit with my third (again, planned). I mean, we were voluntarily letting them outnumber us!! hahaha But once that new baby is IN your life, you'll hardly remember *not* having her.
Congrats on your new baby (soon) and just relax...it'll all be fine :o)