Good day everyone) Girls, I plan to get pregnant at the end of summer or…

Good day everyone) Girls, I plan to get pregnant at the end of summer or early fall, may God help me. So, what do you recommend from vitamins or how to prepare the body so that it can get pregnant, in the first pregnancy I wasn't prepared but this is already the second one, I want to prepare and prepare the body. What do you suggest?) I know, maybe it's silly, but can you plan the baby's sex?