Preseed

This might be a really dumb question, but I just need some advice on how to use Preseed. I know some girls on here said they used Preseed a few days before they ovulated and some said they used it a week before and then every day of their ovulation! So, I guess I’m just asking on how to do it? Should I wait till my ovulation day to use it, or can I use it now (I’m a week away from ovulation)? 😅😬