How/when to use preseed with irregular cycles??

Been ttc for about 3 years. Just picked up some preseed but I would like to hear some tips any of you might have because of me having irregular cycles! Anyone else with irregular cycles have a success story to share with me using preseed to lift my spirits up?! I’d love to hear them 🥰❤️ my fiancé and I are so excited to give this a shot hopefully we finally get our rainbow baby.