I'm scared...

My husband and I spent a substantial amount of time planning before we got pregnant so it was no accident... 
And I have 17 weeks left and I am so scared about everything and all of a sudden I don't feel ready. 
I've tried to talk to him and he just doesn't understand and now I feel like I fucked our plan... I still want our baby, I'm still excited, I'm just really scared... 
Posting on here is really a last resort. Anything would be helpful at this point...