Depression/Anxiety? Help, Please.

Our pregnancy was planned and it took us a year to get pregnant. I have always wanted to be a mom and dreamed about it forever! It's finally come true! I've been so excited this whole pregnancy and looked forward to every step along the way. Now that I'm set to be induced in just 4 days I've all of a sudden become overwhelmed with anxiety, irritability, and depression. I'm not sure if it's because I'm just terrified of actually becoming a mom. Or if for some reason I'm not feeling ready anymore. I keep thinking about how right now I'm have nobody depending on me and in just a few short days a tiny human being is going to need me for literally everything. I'll go to the hospital pregnant and leave with a baby. My head hurts from thinking about it. It's like I can't wrap my brain around it. I feel like the worlds worst mother because I'm having thoughts that I might not be 100% ready like I thought I was. Is this normal? Is it just pre-labor jitters or is there something wrong with me? My husband is cool as cucumber (on the outside at least) and says he has had the last 9 months to sort his feelings out and to get ready and excited. It makes me feel bad that I am not the same way.. Help calm my nerves, please.