Don't want my baby anymore?

My husband and I both have wanted a baby for a very long time. Over 4 years. We are finally in a financial situation where we can, and I am now 36 weeks along. We were so happy with finding out we were pregnant! Why all of a sudden do I have feelings that I don't want the baby anymore? Now that's it's getting closer, I feel like I don't want it more and more. What's wrong with me? :(