Is it wise to take prenatal vitamins while TTC? Or take normal vitamins until I'm pregnant?

I'm not pregnant yet.. but trying for #1. Because of the weather and trying to avoid getting sick, I've been on a journey of eating healthy and try to choose healthy vitamins. I saw this at the store and it does say: "before,during and after pregnancy". So I bought it since I am trying. Now I'm second guessing myself if I should wait until I am pregnant for sure- just incase it does take a long time to get pregnant.. Would the dose amount be bad for me overtime or it really doesnt matter?.. what do you think?