21 Day Cycle Overview
Ovulation: Day 7
High Fertility: Day 2 – 8 | Next Period: Day 22
When to Test for Pregnancy
Implantation typically happens 6-12 days past ovulation. If you have a 21-day cycle, testing before Day 20 might yield a false negative because hCG hormone levels haven't concentrated enough in your urine. The most accurate time to test is on Day 22 (the day of your missed period).
Your Specific Cycle Metrics
| Cycle Day | Biological Event |
|---|---|
| Day 1 | First day of period (Full Flow) |
| Day 2 - 8 | High Fertility Window |
| Day 7 | Estimated Ovulation |
| Day 22 | Next expected period / Testing Day |