Fertile days and ovulation, estimated.
The six fertile days ending on ovulation, how a calendar estimates them from your cycle, and why an estimate is never a way to avoid pregnancy.
By Suraj Kumar2 min read
Pregnancy can start only on about six days of each cycle: the five before ovulation and the day itself.
Six days.
Wilcox, Weinberg and Baird followed 221 women in 1995 and found that conception happened only after sex in the six days ending on the day of ovulation.
From a calendar.
The page takes ovulation as 14 days before the next period and shows the next three cycles from the first day of your last period and your usual cycle length.
Not birth control.
Ovulation moves from cycle to cycle, so a calendar estimate cannot be relied on to avoid pregnancy. Ovulation tests and a doctor's help are more sure.
Further reading
Topics: ovulation calculator · fertile days · fertile window · when do i ovulate · fertility calendar
A little less theory. A little more doing.
Try it on your own terms, with a free browser tool.
Try the tool