1. 14 days after the countdown of the next menstrual period, 1 day before and after, is the ovulation period. 2.Egg-white like mucus at the vaginal opening: the date when you are most likely to get pregnant. 3.Temperature monitoring method: the time when the body temperature is the lowest (about 20% will appear), or the body temperature is suddenly higher than the basal body temperature for ovulation. 4, 4-5 days before the ovulation period, you should first ovulate once (sperm vitality is strongest at 4-5 days,) and have intercourse during ovulation, the day before ovulation and the day after ovulation. Note: The maximum fertilization capacity of sperm usually lasts 3-4 days, the life span of the egg after ovulation is only 12-24 hours, and the cervical opening changes within 2 days after ovulation to prevent sperm penetration, therefore, 120 hours before ovulation (5 days) to 2 days after ovulation is the period of easy conception. Analysis: Whether or not to be infertile, the first thing to look at is whether or not to have intercourse during ovulation. Recently, we met two patients in the clinic, both infertile for more than 1 year, one separated from the other and reunited once a month, one long-term sea voyage, reunited three or four days a month, the semen routine of the two patients is not particularly low, and careful questioning revealed that it may not be reunited during ovulation and intercourse, therefore, fertility should first catch the ovulation period!