I flip flop every day...😖😞

I am 32, happily married to my husband who is 35, we just built a 4300sq foot dream home and have no kids. I KNOW I was born to be a mom and have been waiting my whole life for it. BUT, I AM TERRIFIED! I never was scared to be a mom and it’s so weird that now that I’m “ready” I’m scared... I just know how big of a change it is and some days I am in super baby fever mode and then the next day I want to wait a little longer. help! I know I don’t have too much time to keep “waiting”... why am I so scared when I KNOW I want it and I KNOW it’s something I have always wanted and couldn’t wait for... why is my brain doing this to me?!? Any insights or advice would be so appreciated.