How did you prepare for a planned pregnancy?

Elizabeth☀️ • Started TTC in April 2015, still waiting for it to happen...
I hope I'm posting in the right section! My boyfriend and I plan to start trying to get pregnant this June, after he finishes school. I'm curious as to what you all did to prepare your body for pregnancy? Should I start taking prenatal vitamins ahead of time? What changes did you make to your diet? Any information and tips are appreciated! This will be my first pregnancy and I want to be as healthy and prepared as possible for it.