The 14 days before menstruation is the easiest time for women to get pregnant. This is due to the fact that women’s menstrual cycle is divided into follicular phase and luteal phase, as the time of each woman’s menstrual cycle is not constant, some are long, some are short, but the luteal phase is fixed, the luteal phase is about 14 days. To calculate a woman’s ovulation period is 14 days before her next menstrual period. If a woman wants to get pregnant, she should try to have more intercourse during this time, and if she needs contraception, she should try not to have sex during this time, or she must take an efficient contraceptive method if she has sex.