Why do I feel like a baby won't "fit in"?

Audrey
Halfway through week 8, and I suddenly have a feeling that a baby won't "fit" into our lives. It doesn't make any sense; We're both 26, have been married 4 years, we're so happy together and he's excited about the pregnancy, we have our own place even if it is just a tiny apartment, and we can even kind of afford a new baby. We'll probably go into a little debt, but doesn't everyone the first time? My husband is even encouraging me to be a stay-at-home mom, he wants to provide for us. So what else could I ask for? Did you have doubts, even when your pregnancy was planned? (This one was!)