In a typical 31-day menstrual cycle, ovulation usually occurs around the midpoint of the cycle, but it can vary based on individual differences. Based on the evidence and sources, ovulation generally occurs between days 17 and 19 of a 31-day cycle.

When do most women ovulate?

• For a 31-day cycle, ovulation is most likely to happen around day 17 to day 19.

• The fertile window, when conception is most likely, generally spans about 2 to 3 days before ovulation, making days 15 to 19 optimal for conception attempts.

How to predict ovulation accurately?

• Tracking basal body temperature, cervical mucus, or using ovulation predictor kits can help pinpoint the exact day, as cycle length can vary due to stress, illness, or other factors.

• Remember, the timing can differ, so understanding your cycle's pattern over several months increases accuracy.

In conclusion, if your cycle is consistently 31 days, expect ovulation around days 17 to 19, with your most fertile days being a couple of days before this window.