How long are you “super fertile” for after birth?

Exclusively breastfeeding and haven’t gotten a period. Used the pull out method for 10 years, always worked (have 4 kids, all intentionally♥️). Hate what BC does to my body. 8 weeks PP. We’ve been using condoms and I hate them! Want to go back to our pull out method but i’m afraid i’m still in that “super fertile” stage everyone talks about 😅