Fertile Accurate?

FarmWife 🌾 • 2015 👧🏼 2017 👼🏼👼🏼 2018 👧🏼 🌈 2020 👶🏼
How true do you think the fertility dates/percentage is on here. Anyone think that it is dead on or not? I'm just curious as if anyone is fertile longer or shorter amounts after there period..