Pregnant with my second child and having wierd feelings

I have a 5 year old daughter . I am 36 weeks pregnant with my second daughter . I am having a hard time feeling like this pregnancy is real / going to work out . I mean I know it's real and I am 36 weeks but I just can't visualize life with this new baby. The thing is we want this baby so this isn't a regret thing or a nervous thing . We want this baby very much so but for some reason I keep feeling like it's not going to happen even though it is happening . I sound crazy probably I just can't shake this strange feeling and thoughts .