It's great that you're thinking ahead about preconception health! For starters, a balanced diet with plenty of fruits, veggies, and whole grains can really make a difference. Folic acid is key for early pregnancy health, so a supplement (around 400 mcg daily) is a good idea. You might also want to check in with your doctor to ensure you're up to date on any other vitamins or supplements, like vitamin D or omega-3s, depending on your needs.
As for lifestyle, staying active with regular exercise, keeping a healthy weight, and avoiding smoking or drinking too much alcohol are all things that can help. Also, getting enough sleep and managing stress are important factors to consider. Don't hesitate to talk to a doctor for personalized advice, especially since everyone’s journey is unique.