The day of ovulation is generally 14 days before the next menstrual period, the specific day of menstruation there are individual differences, mainly related to the menstrual cycle.
If the menstrual cycle is regular and lasts about 28 days, the day of ovulation will be on the 14th day of menstruation. 5 days before and 4 days after the day of ovulation, plus the day of ovulation, all these 10 days belong to the period of ovulation.
If the menstrual cycle is irregular and the time of the next menstrual period cannot be predicted, the day of ovulation cannot be determined accurately. If these women want to monitor ovulation, they can use ovulation test strips or have an ultrasound to monitor follicle development and ovulation.
Ovulation is the easiest time for a woman to conceive, so you can have intercourse every other day to increase your chances of conception.