Depression out of no where? Anyone?

this is my fourth pregnancy and have NEVER had depression nor post partum. So today I came home from work which was a great day and all of a sudden I just felt overwhelming emotions and broke down hysterically. Crying and an anxiety attack.  I'm 13 weeks tomorrow and I just don't understand. My fiancé is trying to help but I just keep saying I feel alone, I feel like I have no one... I'm not close to my family but I have my OWN family which I'm not sure why I feel so alone. I just feel overwhelmed by the time in which I feel like we have done nothing to get ready for the baby ... Is this normal? Lol