Your 6-day fertile window: 5 days before ovulation + ovulation day.
适用场景：想精准锁定最佳受孕窗口，或者想自然避孕的女性。
使用方法：输入末次月经和周期长度，查看6天 fertile window 的可视化时间线。
结果解读：绿色标记是 peak fertility days（排卵前2天），橙色是 fertile window 其他天数。
Sperm can survive up to 5 days in fertile cervical mucus. The egg lives 12-24 hours after ovulation. Your best chances are the 2 days before ovulation.