Pre-Partum depression??

Baby # 2 is due anytime for me and I'm really struggling to grasp this. As ridiculous as I sound! There is just a lot of stress surrounding this baby. My job, my home life/marriage, etc are all contributing to the stress and I don't have a minute to just be a hormonal pregnant person. I find myself crying and thinking "is this really happening??" Most all the time.
Is it all that stuff or is this just something normal for baby #2?