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Fertile Window Opens (Day)
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Fertile Window Opens (Day) vs Days Since Last Period Started
公式
Fertility Window
The fertile window is the 6-day period ending on the day of ovulation.
Ovulation Day = Cycle Length - 14 Fertile Window = Ovulation Day - 5 to Ovulation Day
Conception Probability by Day
计算示例
A 28-day cycle, currently on day 8.
- 01Ovulation = Day 14
- 02Fertile window = Day 9 to Day 14
- 03Peak fertility = Day 13
- 04Days until fertile window = 9 - 8 = 1 day
常见问题
When am I most fertile?
The day before ovulation and the day of ovulation have the highest conception probability. The 2-3 days before ovulation are also highly fertile.
How long does the fertile window last?
The fertile window is approximately 6 days: the 5 days before ovulation plus ovulation day itself. Sperm can survive up to 5 days in the reproductive tract.
Can I get pregnant outside the fertile window?
It is very unlikely. Conception requires a viable egg (12-24 hours after ovulation) and sperm (survives up to 5 days). Outside this window, the probability is near zero.
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