Whether you track ovulation with a calendar or monitor cervical mucus ... but your fertile window begins about five days before ovulation and drops significantly just a day after.

"We were surprised to see how variable it (the fertile window) was," said Wilcox ... who are trying to avoid pregnancy not to use the calendar method because it is very unreliable, particularly ...

Track signs of ovulation using a calendar or app to determine when you ... or on the day of ovulation is considered your fertile window. But, ovulation varies from person to person, so it's ...