Prenatal Vitamins

🐝-zz off!
My doctor just put me on a prenatal vitamin... I'm TTC, I'm not pregnant, but do you think taking these vitamins will help with conception? I'm confused, I thought you take prenatal vitamins while you're pregnant. ? My cycle has been off for the past 2 months, and I don't know when I'm going to ovulate next. What is the best ovulation kit to use?