Prenatal vitamins

My Obgyn told me last year that if I ever thought of starting a family, I should go ahead and start taking prenatal vitamins. Being the procrastinator that I am, I never did. My DH and I started TTC in March, and got multiple BFNs. I was really thinking it was going to take a lot more work, but recently got my first BFP.. Now I'm worried since I only got the vitamins last week. Any thoughts?