Just found out this morning. Excited but scared

Lauren • 37-yr old wife to Justin and mom of two! Airbnb host, ad sales lady, carb enthusiast learning to play the piano.
How do you get past all of the doubts and fears? Right now I have anxiety- like are we crazy? Should we have done this? Are we ready? Am I going to lose all my freedom? 
I had similar fears when I got engaged to my husband, and that was one of the best decisions I made. We both laid in bed next to each other the night we got engaged and both just felt weird and awkward. And right now, we're kind of the same. But right now I'm just anxious and can't medicate myself (sigh- no Xanax for me!)
Thanks for any advice you can give. Xoxo