TTC Newbie who needs some advice!

My husband and I decided that it was time to start TTC. I've been excitedly googling my brains out about what to expect when stopping birth control, and what I should be doing to help us get pregnant etc! I made a doctors appointment immediately but it's still 3 weeks away! Should I be taking folic acid (I heard you could buy that over the counter) or other supplements or just wait until I see my doctor? We don't want to tell anyone we are trying until we are pregnant so I can't ask anyone! Anyone have any helpful advice for me!