Under normal circumstances, the menstrual cycle is regular. Ovulation is usually about 14 days before the next menstruation, and 10 days between 5 days before ovulation and 4 days after ovulation is the ovulation period, which is also easy to get pregnant.

If the average menstrual cycle is about 30 days, the period from May 2, that is, ovulation occurs around May 18, and the ovulation period from May 13 to May 22 is also a period of easy pregnancy.