Feel like I should be preparing more!

My first trimester was a little rough so I just focused on myself. Now that the second trimester is here I'm starting to feel overwhelmed! We started our registry to get a head start and I think it added to the anxiety! I feel like there is so much I don't know yet and should be reading about. I have the what to expect when you are expecting book, but what are you ladies reading to actually prepare for a newborn? Sometimes I feel like I'm overthinking things, my moms says to stop worrying it comes natural and you learn as you go but I'd like to be somewhat prepared!