FFS-TimelineBy 1cc6h / September 2, 2025 You are here You are here You are here You are here You are here 0% - 25% Critical Fertility Alert 26% - 59% Fertility Action Needed 60% - 84% Prime Preparation Stage 85% - 100% Optimal Fertility Zone Critical Fertility Alert Fertility Action Needed Prime Preparation Stage Optimal Fertility Zone