Conception supplement question!

Hi everyone :) me and my partner are on month 6 ttc #1, and I picked up some 'Seven Seas - trying for a baby tablets' and some evening primrose oil about a week ago. I've read that with the EPO you're only supposed to take it up to ovulation. Does this mean to take it up until the start of your most fertile days? Or up until your actual day of ovulation?! A little confused! Thank you for any help you can give me ☺️ xx