Pre-Seed Help!?!

Abby • 👶🏼 Danny Lee 7/22/17 👼🏼 12/12/17 👶🏻 Deagon Levi 12/17/18 👶🏼 Daxxen 8/15/2020 Army wife 🇺🇸 Breastfeeding Mama 🤱🏼 Natural Birth Survivor x2
I got yet another BFN this month and I am wanting to try pre seed but I know NOTHING about it! My hubby and I have been TTC for one year now and I getting really depressed every month when I get my bfn 😭 so what's the best pre-seed?!?